I don't know your full situation, but in reading your other questions, you don't seem to be having a good time right now. You have to find the strength in yourself to stand up to her. I had this same issue with my step mother when I was growing up. After she realized I wasn't going to take it any more, she stopped.
Don't harp on it with your husband. Be smart about it and don't let it elevate. You have to learn to turn the situation to make her show her true colors. If she wants to make it seem like she is doing everything, have her do more in front of people. "MIL... I know you ALWAYS do XYZ can you do that for me right now...." I really hate to play games, but some people only work that way. Also, try to find a few good things about her and compliment her. With these things, you are showing you are in control while not completely isolating her. It's a hard balance, but you will figure out what works for you.
Find confidence in yourself and don't let people dictate how you feel. You have a hard road right now and I hope you find a light soon. I'm on marriage #3... My first was abusive, my second an alcoholic. It took me a lot to find the right man and I thank God I did not have kids with my other husbands. I did not want any child I would have had learning those behaviors to pass on to their children or thinking that was ok. It's not! The best thing a parent can give a child is a loving and stable home. In that, confidence and trust is built.
Find your strength...