Any further letters/communication I would write REFUSED and put back in the post.
She is a toxic relationship. Those around her know it I am sure, but misery loves company.
You have to get away from unhealthy relationships, that is just the reality. Just because she goes to AA does not mean she is working the program, sort of like Sunday Christians. Time in does not equal time workin the program.
Tight Hugs and God Bless. Take good care of YOU.