I think what she probably meant was this: Depression distorts your thinking and perceptions really badly. If you're telling her about things that happened when she wasn't there, she can't know if they really happened that way or not, she can only know it felt that way to you.

If she's a good therapist, you're not going to succeed in driving her away. She's not your friend, by which I mean she's not going to dump you because of anything you do.