Is it wrong of me to want to cut off contact with a traumatized girl because I didn't know how toxic she really was?
It's understandable given that she may be toxic, but have you considered how cutting her off would make her feel?
She should be strong enough to face the world alone, but I will support her if she's not strong enough.
Well, if she is that toxic, I get why you would want to cut off contact with her. You should not keep people in your life that destroy your peace. But it might be a good idea to talk to her about what's wrong.
And I'm not? That's toxic of you.
I just think it would be best to talk to your friend about some of the behaviors that are disturbing to you. This way you will give her an opportunity to change and grow as a person.