Looking back I realize she saw ever single person she slaughtered with her powers. Collectively slaughtering them for her thrill. She didn't just screw the way, she fucked up the entire uprising.  All the violence against mutants that's gotten more merciless in on her. She didn't care about the repercussions at all.

Any amount of blood spilled was worth it just so she could have a mischievous adrenaline bloodlust high. She wasn't that good. She ruined a lot of things in the time she was with it. 

I loved someone who was a toxic influence towards my family, the inner circle and a bloodthirsty burden.