Closing shared wounds

All this time I've been shouldering survivor's guilt and "should have protected" remorse for her, allowing her to get away with anything because of it. But SHE brought this man, this sex offender, into my home... I didn't know he wasn't her uncle until we were at least 5 minutes away by car. She actively recruited me in her game, so why is it I feel guilt and blame?

She was younger than I, and not to blame either... but maybe I have to cut myself some slack every once in a while... and just tell her how I feel, get closure. I never realized I was angry with her for what she brought into my life.

Can I do that? Should I do that, is it right to open shared wounds for my own closure? Seems like hitting below the belt...