What should i do?... stupid mother in law?

well my hubby had been married before! he has a kid by his ex and they still talk and me and her are still friends.. well she informed us that hubbys mom talks to the ex wife and says ohhh we miss u in the family we wish u were still with him i wish u would get back with him... but when they were togeather they hated her... they hardley talked to her and after he left her his mom was like im sooo happy its over... and now she is like oh come to church with us and all this stuff.. hubby wont say anything to her.. well we had a family gathering saturday and his mom dint say one word to me not at all.. but when she goes and gets her granddaughter for visation she talks to hubbys ex for almost an hr.. and im having a baby and she wants the baby every weekend and when hubby is at work.. what should i do about her?