Mentally and Physically harassed by my wife

My wife isn't interested in taking care of myself, my mom and my son. She abuses my mom and openly wishes her to die. She doesn't take care of my son or myself despite being a house wife. She mentally tortured us with imagined allegations on me and went to the extent of accusing a relation between myself and my mom. Recently she started abusing us infornt of public for silly reasons like not accompanying to toilet e.g. We came to know she was mentally ill before marriage and their parents have kept it a secret from us before marriage and they didn't make any attempts to treat her. She is refusing treatment and burnt all tablets and prescription brought by us. Their parents are blackmailing us on false charges instead of setting her straight. She started selling whatever gold she brought with her without any reason and spending lavishly. Currently my son is with us and she is at her parents house. She changes her workers every other day which she has been doing since 4 years of our marriage. Now she is saying she will take treatment and whatever she spoken to us was in a bad mood. We know this is not true because we have seen her works like this almost 500 times every day after contact abuses to us. She is a fox. I am dam sure she still repeat same abuses if we allow her to our home and may even physically hurt us as she is aggressive and has no fear of repercussions. She is staying at her parents from 7 months and she on several occasions wanted divorce from me. She takes name of divorce whenever she wants ans immediately next day she says it was a mistake Pleaee help us now do we protect ourselves from her and her parents. Can we file a divorce against her ? Since she is cunning and may say that she wants to live with us and change now in court which is obviously a lie . We have video proof in which she openly insulted us by proclaiming a relationship between myself and my mom and several call recording in which she abused us and asked for divorce. We also have photos which she sent to us in Facebook with a man in a close up as profile picture to intimidate us.