HELP me move on! Help a 16 year old girl, I know this is long but still please read and help :(?

You know what. I have a friend who is exactly the same way. And we are 18! His problem is that he is insecure and does not have much to be proud about. So he tries to make me look bad. It doesn't work because I know his situation. This sounds like the same situation for you friend. My advice is to blow her off and to not have anything to do with her. Eventually she will try to be friendly with you again. Be friendly back but don't start being too nice to her or she will go back to her old ways. I learned that because my friend did that numerous times.