It's been a looooooong time i didn't post an edit xD I can't edit anymore such a fail x_X Yeah so when she was a child, her parents were mean to her and said to everyone that she was a demon, that she's useless. She was bullied by everyone. "EDIT" Okay so hum she doesn't kill everyone xD She just kill some bullies, so after that her parents were horrified, they tought that she was crazy so they "sealed" her memory like that she "forgot" that she killed people. (When she kills someone, sometimes she have flash back about her murder) And after that they abondoned her in Konoha.