I'm so sorry to read this. I have a 6 year old girl myself and while I haven't been through this, I can understand how you feel. Have you tried hobbies with your daughter where she can see how good she is at something? Maybe if she feels special about something she is capable of, she will be less inclined to think about how different she is. I have no clue what it's like to have a preteen so my suggestion may be completely wrong. Just hate for girls to think so much about beauty when they are capable of so much more.