Mental harassment by mother in law

Hi sir, I am architect by profession my husband is working in an IT company My mother in law Is a single parent. I got married in -2018. My husband and i have second marriage as my husband was divorcee and my previous partner met with an accident and passed away. After making fresh start me and my husband are very happy together our bonding is very strong our understanding is also balanced. But my mother in law is not happy from very first day of our marriage as my husband is her only son and that possessiveness of her has tried so many times to spoil our relationship i am surviving here and listening to everything just because of my husband but now she has crossed all the lines. I am 4 month pregnant and she is thinking that i am helpless now and i cant take any step against her. Earlier her complex was sharing her son with me and she use to say bad words out of that complex which were acceptable at some point, then she started breaking the stuff which my mother gifted us on our first anniversary then she tried to lock me inside house and snatched my mobile phone so that I couldn’t contact my family, but now she has crossed lines and started abusing me in very bad manner and she has started saying bad words against my family which is not acceptable for me now. I have recording of her where she has used those abusive words. My husband is truly innocent and helpless as well because when he argue with her she starts emotional blackmailing.I dont want to force him to leave his mother alone as she is aged and she need someone with her all the time. But its really hard for me to share one roof with her. What should i do now! Please suggest.. what kind of legal action i can take?