There's all sorts of help from books to classes to informal discussions with people we know and trust. It sounds to me like she has very low self-esteem; were I thinking/feeling the way she does (that people are just using her, that other people are lying to her) I would want better self esteem so I didn't think/believe that way or so that I didn't need to be around those sorts of people, could say "no" or not allow their just using me. Were I you :-) the next time I told her she looked nice, etc. and she denied that I would want to know why she's calling me a liar. You are in charge of how you feel and what you see, not her. If she denies your experience, your point of view, you have to stand up for yourself. You are letting her get away with her perception being "right" for you! She doesn't have to get help for herself if she doesn't want to but don't let her attack you and your self esteem!