Pretty much what Drip said + once she has a self buff of 40% critical chance. I´ve seen her on DMM with some other crit. girls just pop that ultimate (which is bitchn as hell to be honest... I mean she has two levitating swords while also levitating herself, pretty badass) and cut through the Health bars of enemies like they were butter.
I believe once she is bloomed she has either an attack debuff or skill activation bonus. And yes she has a bloom form