I'm not sure if this is helpful, but know that maternal feelings toward therapists are so common as to be almost expected. In fact, as far as I can tell, therapy is more or less designed to make you feel that way. If you go through other posts here you will see dozens of people expressing these same struggles.

That may not make much of a difference to you while you're in the throes of these feelings, after all, it doesn't matter how many people have felt something if you're feeling it for the first time, but your T is not going to be surprised by this news and she's probably been told it dozens, if not hundreds of times before depending on her length of experience.