We know what we know. Everyone has their own knowledge about the world, how it works, etc. We can't use other people's knowledge and beliefs. I don't think she wants to "influence" you and your beliefs/problems by telling you whether or not she believes you. Would someone work with someone they didn't believe? We have to learn to sort out questions like that for ourselves and decide what we believe about the people in our lives. Just because she believes you does not mean she can necessarily help you and the reverse of that needs to be true; she might be able to help you whether she believes you or not. As long as you think, "Maybe im crazy and shouldnt believe myself" then she shouldn't be in there influencing you. That's your task, figuring out whether and what you believe.