Just my opinion and personal experience so please take this "advice" in the spirit it is given.
CAGs are so intelligent and observant that they take longer than other species to trust and forgive. Add to that their inherent stubborn attitude (I used to raise and train donkeys and CAGs have them beat for stubborn).
I really feel you are on the right path you just need to go agonizingly slow. Mable will come around eventually. I would treat her as you would a badly abused rescue. That sounds like what she is and that is what you did.........you rescued her and bless you for that.
I'm so very sorry this happened to her and to you.