Harassment of a guy by in laws

Hello all and thank you for your time. I've been married for about 10 months now to a girl from a different state. Ever since the day of the marriage, my mother in law has been torturing my wife about her decision to marry me. Being a single mom, she has been emotionally blackmailing her with things like she's sick , living alone and not being able to manage. They both call each other and fight continuously with most of the discussions on my mother in law telling her how horrible I am.This has been on for all these ten months. My wife takes out all this frustration on me. My family and I has been nothing but nice to her and being people of standards, we never asked for dowry or any of those things and moreover she was happy being with us than her own mother. Two weeks back, I completely lost it when my wife hurt herself intentionally after a phone call with her and I sent her back home to deal with this situation with her mother. She's not willing to accept any solutions that my wife and I had to offer for her well being. Now it has come to a point where my wife is considering divorce to solve this. I'm dead against it. Her mom doesn't seem to have a problem with it as she is only concerned about herself. What legal protection do I have if my mother in law decides to coerce her into divorce or file a case against me with some false allegation? I'm pretty sure my wife will not do anything to incriminate her own mom even though she knows the whole truth. And I am not considering divorce.