Does anyone know a support group for mother-in-laws?

I have a very controlling daughter-in-law . Yes, we have all been to counseling. We respect the fact she is our only child's wife and the mother of our granddaughter, but we feel we really don't have a daughter-in-law. Yes, we have done nothing but try to welcome her into our family. Her main goal is to keep our son and granddaughter away from his family and friends. Yes, he loves her so we keep quiet but have talked to him about our feelings, with and without a counselor. The counselor has addressed her behavior but she refuses to change or admit it. There is so much awful talk about mother-in-laws but there are those of us to truly try to do everything right. They live about an hour away from us so we do not get to see them often. There is a "best friend" attachment with her mother (they live 2 miles apart) and she seems to always come first. Just looking for mom's in the same situation. There really are good mother-in-laws out there who really try.