Need Divorce from wife suffering from Bipolar disorder

Hi Sir, I want divorce from wife who is suffering from Bipolar disorder. I got married with her before 10 months in Hindu rituals (both are Hindu).She is suffering from this mental illness before marriage but I was not aware of it. After 9 months of our marriage she got sevear attack and I was shocked what is happening with her. I took her to doctor. Doctor told me this is psychotic disorder, also ask weather she has history or not. So I called her parent n asked over the phone they said she had problem before 6 years back. I asked them for her previous report but they said it's lost but they said her previous doctor(hometown) is in town we can go to him.we both travelled to hher hometown and then her previous doctor. Her doctor said she had problem 6years back n was not giving me more details (documents)information about her illness. We admitted her to his hospital and after two weeks she got discharge from hospital and now medicle treatment is going on.she was so angry and out of control of her mind and body in hospital too. But her parents were not so schoked as they knew it. I want divorce from her, I can not take it anymore. Can I file divorce now. I don't have her before marriage illness proof because I was not aware of it but I have current all medicle documents. I am not sure her doctor will give me doc. Stating that she had problem before 6years. Please suggest me what to do? Can I file case for fraud and cruailty ?