Mental torture by suspicious wife

We had baby within a year of marriage n that became issue for daily argument between us. I told her I will be supportive for her career but no use. She started arguing with me over sms ,phone. Later I stopped replying her annoying sms since it was affecting my work. But when I home same issue. My mother n sister started living separately when she accused them with false mental harrasement. I tried my best to take care of her in her pregnancy but whatever I do she finds it wrong. Now she is at her parents home but still fights with me saying I spoiled her career ,life calling me in singular ,teases me by comparing me with her friends husbands. She started creating false picture of me by recordong our arguments over phone. Her mentally torturing sms are still not stopped. Worst thing she threatened me that she will trouble my mother who is pschycological patient n will defame my family in relatives. I am done here. Totally done by these kind of nags. Please advise me how can I protect my mother from this. She is in her old age and suffered lot in her past life(widowed in young age).