Welp thats BS.
Girl treats her like shit and wants to kill her, but dad apparently made her forget some trauma, then when she remembers, she cries like omg I shouldn't have been mean
Excuse me?? Just because you forgot some memories doesn't give any excuse on wanting to kill your sister.
You're still a horrible person because everything you've done until this point is unrelated to whatever was in that flashback.
I mean where did you get that bad attitude from, if you forgot all the memories previously? Nothing justifies becoming an asshole after that "oblivion" BS