shamain,
have you tried talking to amber yet. the easiest way to resolve a problem is to confront it. go to amber, tell her why you moved, and that you were not getting an attitude. at your age, people are going to act like that and be immature. that's a part of growing up. if she was really your friend, she would get over the whole thing, as long as you talk to her about it. Good luck, and let me know how it goes.