I agree with this. In the past (mainly in my earlier years--jr high, high school) I had people do this to me. It's not very respectful to you, especially when you've asked directly for clarification. At the same time, it sounds like you may be projecting a certain lack of self-worth to her ("she knows I don't think she really likes me" etc), and that can turn people off sometimes, even if we are well-meaning and friendly in other ways. And maybe she knows that you don't feel very good about yourself and she doesn't want to hurt your feelings.

I think it is in your best interests to let this person go, and find people who treat you with respect and want to be around you. If you feel like you don't have other friends (I've been there before as well), then I encourage you to build yourself up. It's very important to like who you are and to like spending time with yourself. As cliche as it sounds, if you don't like being with yourself, no one else will like being with you either. When someone gave me that exact advice, I was in a place where I hated being alone because I was so bored and lonely, and I hated who I was. Now I actually prefer it, haha. I still struggle with self-worth and loneliness, but I like hanging out on my own, at least.