How to Get Divorce or permanent sepration

I am married since last 3 years, after 6 months there was lot of fights between me and my wife. She started to harass my mother and father and became envious towards them for no reason. Many a times she loses her temper and breaks our household properties like TV, Tea table, Sofa chair and throws food item like cooked dal, vegetables for no reason. it did not end there at many instances she even use to beat my mother also. It seems as if she is having any psychological problem. lot many times i tried to tell her as well as her parents that this behavior of her is not normal and we shall consult to any good psychiatrist bu they denied and said she is normal and i shall take care that she should not get angry. Apart from this they were very normal of her actions like breaking our household items as if it was bound to happen. After 2 and half years i shifted to upper block in the same house and thought she might have a problem with my parents and things will get normal but she started harassing me and kept on harassing my parents also. Initially i though things will be okay one day but things got worse with time and on one night i was sleeping she woke me up in mid night at 1:00 am started beating me somehow i managed to escape and ran to the house downstairs where my parents use to stay. On very next morning i made a police complaint against her and later on her her parents came and took her with them. In this case how i shall get divorce from her as she is not willing to take one?