Although you say you don't wish to go into it here, obviously whatever was done was severe enough for the rest of your family to keep their distance from you and protect your mother by having her keep distance as well.

You're saying trust was involved here and whatever was done sounds like it was pretty bad. You may never be able to visit her at her home again, who knows. Just because you are checking off tasks (therapist and "some other things") it doesn't sound like you're engaged in really getting help - more like you are doing a list of tasks and are expecting once those are done you'll be back in good graces.

The help you're getting is supposed to be for YOU to be a better person, not to ingratiate yourself with your mother. You also have to let go of the expectation that you'll be allowed to go back to her house. She isn't obligated to "re-evaluate" or whatever you want to call it. Sometimes what people do is a dealbreaker and that's that.

I know you say that whatever you did wasn't abuse, but it sure sounds in some way abusive (possibly financial?) for the family to keep you away from the holiday gathering.