I'm not sure why your therapist even came up with such a theory or why she then told you about it. That kind of dialogue is normally left up to the client to initiate so false memories aren't implanted. I can say is do what you can to not let your mind run amuck (don't over think the situation - let it come naturally) and most importantly, trust your gut instinct. If your t presses the issue again, I'd run for the hills. Again, she sounds dangerous.