I also have to say this. I am very concerned about the fact that your T can freely talk to your mother about anything behind your back. In your situation, this makes therapy very unsafe. If you tell your T what you told here and then she tells your mother about it, this may complicate your situation further, especially given that you and your mother don't have a good relationship.

I seriously recommend you to revoke your consent for your T to talk to your mother before you talk to her again. I would email the T and ask her to give me the form that revokes the previous authorization to talk to the mother, and, if she doesn't have that form, I'd simply say in the email that I withdraw my authorization and that I no longer want her to talk to the mother. This should be enough for her to stop all communications with your mother. You just need some form of documentation to show that you requested it.

I also wonder if your mother knows about your father's current behavior toward you like inappropriate touches and things of that sort. And, if she does, what is her reaction? What is she doing about it?