I don't think you need to work out that it isn't really erotic love and is just "maternal transference." If you have erotic feelings it's erotic... and all erotic love is based in transference, and transference just means feelings.

Honestly, you should discuss it with your T, although I know that's easier said than done! I really suggest reading this as it was very eye opening for me Psychotherapy : Erotic Transference this article made me feel much better about my feelings for some reason.

No, I don't personally think you should find a new T. I'm not sure if that is right or wrong... but that is my gut feeling and what I decided to do. Maybe loving your T can continue to help you, and will eventually show you how to love others, including yourself more