mom is stressing my pregnancy

She has said some nasty things about me behind my back, implying I'm a slut for the above reasons etc. when she as caught she promised to change and put in an effort because she wanted to be a part of my child's life. But since then, she has put very minimal effort in terms of giving my future husband a chance. She has refused to tell me what she thinks about him (good or bad) she just doesn't want to talk about it. When she first met him, she couldn't look him in the eyes and only asked one question and basically spent the night conversing with other family members instead. She is the only one acting like this. My siblings and dad understand that we are not in an ideal situation but they want to be in the baby's life and so they are making an effort to build a relationship with the dad. 

I'm at a loss on what to do. She has stressed me to the max with her behavior. It's almost like she wants me to walk around ashamed of the path life has taken me on. I believe she is ashamed of me. I can't continue this pregnancy walking on eggshells or having her disrespect my husband to be. What should I do?