What should I do if I meet such a mother-in-law

It is enough to think that you have done your duty as a daughter-in-law. There is no need to please her, but don't quarrel. Go back to your room to calm down, meet less, make no noise, please, and get better slowly. It is important to clarify the key points and facts with your husband, and don't let your mother-in-law disturb the marriage. I've had something very similar before, but it's much better now. We pay for each other and respect each other. Give it a try!