I have a feeling there is more to her story than you know about. Do you have contact with her after she broke up with you?
My suggestion is, take her at her word. If she wants to move on, let her move on. Ignore her comments about you being "toxic" if they bother you; people give all kinds of reasons when all they are really saying is, it's over for me. If it's over for her, it's over. You can't have a relationship by yourself.