OR – there may really be something that the rabbi said or did that made her uncomfortable, something that the young man might not be perceptive about or receptive to hearing. Maybe something happened that made her feel the rabbi was getting too personal in some way. WE DON’T KNOW, and neither does the OP, because he has not yet found out what it was.
Please talk to your lady friend and get her to be honest with you. Don’t take a vague answer on its face. If you cannot communicate NOW when it is important to do so, you may never be able to communicate. This might all be an innocent misunderstanding.