I'm glad your mom wants to be in your crisis team!

You mentioned not having anyone but T. Don't you think that would be something to work on? Do you work or volunteer? Do you have hobbies? Of course during covid it's harder to start something new, but it won't last forever. It sounds you really crave human contact and you seem like a nice caring individual who has lot to give also. Have you thought about finding more people to share your life with? You have mentioned a dog, maybe with the dog you can find people with same interests?

Your T sounds really great, but she is just a T. A therapist is of course important if you need one, but in the long run people that are not only in a professional relationship with you are what life is all about.