Harassment by mother in law

Hello Sir/Madam, I am a highly qualified post graduate from a top college in India and so is my husband. Ours was an arranged marriage in 2016 and during the initial conversation my now mother in law mentioned that she had given a dowry of 60 sovereigns of gold for her daughter's marriage. My parents made it clear that they will not be giving any dowry. At that point of time my MIL did not show any concerns and we went ahead with the engagement. Soon after the engagement my MIL called my mother and asked for a pair of diamond earrings, a gold chain, a bracelet and a ring. I was not happy with this demand and let my fiance know about my discomfort. I told him that I was equal to him in every aspect and any forced give and take was not acceptable. He told me that he was also in principle not in favor of dowry and told me that he would try to talk sense into his mother. As he was reassuring, we went ahead with the wedding, although my parents decided to fulfill the post engagement demands. Unfortunately even after the wedding and for a year now, my MIL's greed for more gifts from my parents has never faded. Sometimes she wants silverware and sometimes a king sized cot. I have always protested against her demands that her son and I earn enough to fulfill our own needs but she never seems to listen. She is of the opinion that she should get back from my parents whatever she spent on her own daughter. Although my husband is otherwise nice to me and treats me with respect, when it comes to his mother's demands, he doesn't interfere much as he also has no control on her. It doesn't stop at dowry. My mother in law shows no respect for me and my parents. She always tries to instigate fights between my husband and me even with petty issues. She once even beat up my husband for supporting me in one of the arguments with her and blackmailed us that she'd commit suicide and mention our names in the suicide note. Now that I'm pregnant, I'm more wary of her violent outbreaks and do not want my baby to be hurt in any manner. Please advise what I should be doing now. As my MIL is a single parent, she wouldn't even let us stay away. I'm sure that my husband will not support me if I go for any legal action against her. Is there a way I can save my marriage and also put an end to this daily domestic struggle?