I agree that considering the circumstances these behaviors are "normal", however considering what she is going through if she isn't in counselling or therapy yet, she needs to be. She has not only been abused but most likely feels abandoned by her parents no matter how well the tried to explain. She needs to find a safe place or person to express these feelings, a counselor or therapist is trained for that. If she is in therapy or counselling maybe mention your conserns to her, she would know for sure what to be concerned about. Whatever you do please don't let this fester, I was her, i held it in, no one should feel that way or have to deal with the consequences of holding it in.