I don’t know how long you’ve been dating, which would be helpful for my advise, but given what little you’ve told me, I don’t think you need to be worried about this or that you need to confront her with what you’ve found. She’s gone to a neutral third party to express her concern about her relationship with you. Obviously she’s uncertain about the two of you together, and you can be your best self, but ultimately, she has to decide if you are right for her. The best you can do is let her see who you are so she can make an informed decision about continuing to date you. You don’t want to sell her on someone you’re not because that will eventually backfire, use the information for your own edification, but not as a reason to confront her about “the relationship”.