My mother is law is a b*tch too. She is jealous of me being with her son, and try to dominates our lives. I used live in the same street with her, but last year we decided to move further away, then she didn't dare to push any further. Luckily my husband stand on my side, and told her to leave me alone. Now i decide when i feel like visiting them / inviting them over, or we don't see each other for more than a month :)
My husband never stood up for me in front of his mom, at some point i was sooo hurt and frustrated i told him he can go back to his mom and be a mama's boy if he keeps ignoring my feelings and stop trying to maintain a good relationship between me and his mom. It wasn't very nice of me, but it worked. U guys should try.