This is the story of a girl raised by her aunt to be able to do whatever she wanted with her life.
However this story doesn't start there, it starts before the girl was even conceived, in a different universe entirely where the youngest archangel has just been told that the Apocalypse is happening in the next eleven years, breaking her completely.
But maybe this particular story started long before that, at the original fall where this Archangel, still young, full of love and hope, lost two of her older brothers and started to crumble.
This Archangel is broken beyond repair now, the slight crumbling a distant memory, she doesn't care anymore and decides to leave, no matter the cost.
This is where the girl comes in, supposed to be a stillborn for the parents to mourn over while raising her twin, fate's plan for her is thrown completely off course when the soul (or at least what counts as a soul when speaking of angels) of a broken and battered Archangel travels across universes and fills the child's body just as the nurses are prepared to announce the baby as dead, bringing the body back to life.
The parents name their first-born, a boy, Harry.
They name his twin Althea, they got the name from their universe's bible: Althea, the youngest Archangel and the bringer of truth, they didn't intend to name their baby anything biblical but it just seemed right.
However it must be a mistake that she feels like there is more power in her pinky finger than most wizards have in their whole bodies, it also MUST have been her brother that defeated he-who-must-not-be-named that night, after all the first born is always the most powerful and Althea was born second.
Breaking lights when she's emotional just shows that her brother must be even more powerful.
Not that anyone realizes that it was but the prophecy being spoken on the day that the youngest Archangel broke must just be a coincidence...right?