Prior to triggering, she led a relatively normal life. Without Coil's interference, she might have just stopped trying to use her power.
Her personality was obscured by her forced drugging and was instead obsessed with her candy, her understanding of the addiction. Her relative complacency during the event could be affected by the fact she knew she might get to come home someday.
After her release, she became focused on humanity's survival in preparation for the End of the World and was willing to do morally questionable things to increase the number of lives saved.
She met her a few times but had only two possibly three conversations of note with her.
Was protective towards her both for being grateful for the hero's assistance and because of her role in saving the world.
Dinah has the ability to see the likelihood of something occurring in the future which her power resolves into a percentage chance. She does this by perceiving trillions of possible universes and sorting them into groups based on a single event.
At Coil's insistence, Dinah also demonstrated the ability to pick out a single timeline and interpret it which was used to see a future where Crawler did not kill her, Coil, and the Travelers. It allowed them to find a situation where they could escape and then employ it.
She can't help but use her power if someone asks her a question, and lying about the answer messes up her power for a while after. Likely because the thinking and actions relating to this answer affects the results.
Her power was not absolute, it could be affected by "stoppers" likely Thinkers who have powers that can cause the actions of others to change.
In years after being released her power had grown stronger, allowing for more questions per day.
Following the Teacher's defeat by The Wardens, terror-attack on mayor Wynn and call to evacuate The City, Nieves brought Dinah to Wardens. Dinah argued that Contessa is untrustworthy. She reported her previous manipulations to The Wardens, but denied examinations by Thinkers and threatened with Palanquin involvement if she was detained. She prophesied several almost imminent catastrophes with mass civilian casualties, all with Contessa overseeing them.
The thinker group she was part of was targeted by The Simurgh during her assault on Wardens Complex, and suffered continuous attacks from compromised individuals. Eventually, some of the thinkers succumbed to Simurgh's song and took Dinah hostage. She was freed by Victoria Dallon and helped her to disable The Mathers Giant.
↑She went by Kid Cassandra while doing contract work, the Heartbroken said Tattletale coined the name to annoy her. Then she wanted to change it because she’s barely a kid anymore. - Excerpt from From Within 16.2
↑ 3.03.13.2“Dinah Alcott,” Weld spoke. All eyes turned to the metal-skinned boy.
“Beg pardon?” Coil asked.
“Thursday, April fourteenth of this year, Dinah Alcott was kidnapped from her home and has not been seen since. Dinah had missed several weeks of classes with crippling headaches in the months before her disappearance. Investigation found no clear medical causes. Police interviewed her friends. She had confided to them that she thought she could see the future, but doing so hurt her.” - Excerpt from Plague 12.2
↑ 4.04.1Not so much that precogs are rare, but that they’re limited. The future is awfully big.
Look at Dinah – her ability crippled her early on, and if Coil hadn’t kidnapped her, she might have abandoned it, avoided using it, because it was that hard. As it stands, she has to search the myriad futures to prune away realities until she finds the answers to very specific questions. AND she’s the third most powerful precog in the setting.
As Coil notes in his interlude (Interlude 8), there’s two major classifications of serial murderer. The controlled one that sticks to rituals and routines, and the unpredictable ones that are hard to catch because you don’t know where they’re going to strike next. The Nine are the latter.
Add the fact that you can’t exactly stick a police tail on them, and any attempt to get in their way is liable to end up badly, and it can be hard to keep track of them. Figure they’ll retire for weeks at a time (see Aisha’s interlude where they’re kicking back in the apartment) and only really cut loose in areas where there’s chaos, and visibility might be low as well. - Comment by Wildbow on Prey 14.1
↑“And as for you, little miss, you seem undernourished.”
“I haven’t had much of an appetite for a while.” (Medical examination describing her condition after being released from Coil's confinement) - Excerpt from Queen 18.1
↑“Headaches,” Dinah answered, pressing her hands to her head, “It breaks my power. It takes days, sometimes weeks before everything is sorted out and working again. Headaches the entire time, until everything is sorted out, worse headaches if I try to get numbers in the meantime. Have to be careful, can’t muddle things up. Can’t lie about the numbers, can’t look at what happens, or it just becomes chaos. Safer to keep a distance, to make and follow rules. Safer to just ask the questions and let things fall into place.” - Excerpt from Interlude 11f
↑ don’t know. There’s too many capes and too many capes with powers that make it fuzzy, because some powers make it harder and a bunch of those powers together make it impossible. I don’t know what happens to start all of it and I don’t know much of what happens during, but billions are dead afterward.” - Queen 18.1
↑The other three-quarters of that board were almost entirely clear, but for one index card in the upper-right:
limits to Dinah ability: can’t see accurately points of interaction with power immune capes, precogs, situ change Thinkers. Limited sight past points of interaction. these are ‘stoppers’
Hartford: No known stoppers in area. Enfield: No known stoppers in area. Chicopee: No known stoppers in area. Southbridge: No known stoppers in area. Boston, Charlestown Area: Yes stoppers, no direct interaction b/w any stoppers and Nine. call to dble check with Still. no interaction Toybox: No known stoppers.
It made a lot of sense. Tracking Jack’s trail of destruction from the point he’d left the city, finding the point where Dinah couldn’t or shouldn’t be able to see, using them to narrow down possibilities. - Excerpt from Imago 21.7
↑We hadn’t made the front page for any of the major papers, the first bit of good news. We made page three of the Bulletin, coming behind a one and a half page story on an Amber Alert and a General Motors advertisement. Part of the reason we hadn’t attracted all that much attention was probably because the bank was hedging about the amount taken. While we had escaped with more than forty thousand dollars, the paper was reporting losses of only twelve. All in all, the story had been more focused on the property damage, most of which was caused by Glory Girl and the Wards, and the fact that the darkness we’d used to cover our escape had stopped all traffic downtown for an hour. I’d been quietly elated by all of that. Anything that downplayed the magnitude of the crime I’d helped commit was a good point in my book. - Excerpt from Shell 4.1
↑“You’d know if you watched the news,” I told Regent, “If you read the paper. I hate that I have to explain this, when I don’t even want to think about it. She’s the missing kid. Remember our bank robbery? How we were weren’t even front page news because an amber alert took priority? That was her. Dinah Alcott.” - Excerpt from Buzz 7.11
↑The humans who have come through the end of the world with hate in their hearts are taking marching orders from the same young precognitive who predicted the end of the world two years in advance. Well, one order with some advice. We don’t know her aim yet, but she’ll be high up on our list. I want a Contessa of my own. - Excerpt from Interlude 8.y II
↑“Alcott? She’s been in the anti-parahuman orbit.”