Well, there are two ways to handle this problem. If you really have an issue with her, then sit down and talk to her about it, and let her know that her attitude towards you and your relationship with her, bothers you.
IF she really cares about you, then she will change her ways, if she doesnt change even after you have expressed your feelings to her, then let her be. Either be with her, or let her go.
As sad and bad as that is to hear, in a relationship no one should have to feel higher than the other person. It shouldnt be like that at all..