((((( wisewoman )))))
I'm sure it hurts your heart so much to be treated like that by your daughter.
Is your daughter her own guardian? Since she is disabled and if she's not her own guardian, if you are, don't you have the right to pull her out of there if it's such a bad lifestyle? Does she receive any services at all? If so, could they help her to learn how to make better choices for herself?
I think you did a wonderful thing to write to her in a loving way and you did the right thing telling her how her treatment makes you feel. She wouldn't know if you didn't tell her right?
If she is in charge of her own life, there is little you can do except to continue to be a stable and loving mom to her. You definitely can let her know you are not impressed with her lifestyle and treatment of you and the family, but you can still be supportive of her in words and from your heart. Personally I don't believe in closing the door to communication unless absolutely necessary (healthwise that is).
I hope you find some way to get through to her and that she can listen to reason without going off and being more abusive towards you.

sabby