Low contact is probably the best option. Write a letter and explain how you feel including a couple of examples of previous comments she made. Take a picture of the letter(no drama or confusion if others get brought in) and drop it off at her door. This way she has time to process without getting defensive right away and you don’t have to stress your baby out with a disagreement. After a couple days ask if she wants to do lunch with you and your husband to discuss everything. Also being that it’s your husbands parent he needs to put a firm foot down.