I suspect my mother in law is sabotaging my relationship with my husband. She's very two faced and likes to twist everything I say. But she's very nice in front of me. What should I do?

I think you should always confront your mother. You can speak to your husband about it. But at the same time you will have to be very cautious about how you are putting across the words, as she is his mother and since it is taken for granted that wives turn the equations for bad after marriage, so you have to careful how you explain things to your husband.