Respect her privacy. She is comfortable enough to share everything with you, but that doesn’t make you the admin of her life. Even if you think she is making a mistake, advice her, don’t try to take control of her life. Respect her decisions and be on her side if she falls. It’s her life, let her live all parts of it. (Also if you know she is going to get some action, give her some space, don’t make it awkward by being the third wheel)