Divorce produces delayed anger and fear responses in children. Those going through a divorce supress their emotions b/c they don't understand it - it is only until they begin to see the "big picture" that it hits them like a ton of bricks.

I would serious get her into some counseling to help her unravel all of her emotions. She's at that stage in her life where she is trying to figure out what just who she is independent of everyone - but needs some help overcoming the past as well as some real ground rules established with consequences re: her choice to "disrespect" and not be a responsible member of BOTH of her family environments.

Action steps:

Set guidelines, give consequences, follow through on the consequences (this isn't fun - but natural consequences are good life lessons and by enforcing "rules" you are giving her the consistency, structure and security that she is desiring.

Keep us posted.