What you are experiencing is ambivalence from her. It is common to have both positive and negative feelings in a new relationship as a result of past experiences in a relationship. She would very much like you to be in her life, but emotionally, she is still scarred from her past relationships. So it's always a push and tug perhaps making you feeling a bit fustrated. If you care for her, please be patient and assure her that you will be there for her while she gradually heals and accepts you.