Broken (Avengers Fanfic)

Abigail Windram, 14, is a girl with a terrible home life. She is constantly abused by her father, but she doesn't say anything. Drawn into her Marvel world, she finds herself in another dimension, and another time.
In a world where she knows everything that's going to happen, how bad will she end up messing the timeline? Or will destroying the timeline fix everything? Will it be good, or bad? Who are her parents in this world? How the hell did she even get there?
Desperate to save Tony Stark and many others from dying, she points out problems before they even happen. But how will that end up? Solving the problem, preventing Ultron, which superheroes will she lose in the fight against Thanos? All this, and she hopes to stop the Avengers from splitting, and Tony Stark from sacrificing his life.
Honestly? Abigail would lay her life down for him. Especially because he will have a daughter. Or will that change too? Is it really worth it? Or will she make everything worse?
Filled with questions, she does the only thing she can think of doing. Stop the attacks from happening before they actually happen.