If the mental ailment is persistent and history or recurrence on and off, it can be termed as incurable though she will be under constant medication, since she has this history prior to marriage, if you had tolerated this all these years and now it is not possible to tolerate anymore, you can file divorce case on the sane grounds, but make sure that you produce the evidences supporting your pleadings. In 498a case also, with the given facts, she may not be able to succeed since she has to deny her own mental ailment. As far as giving a false complaint on 498a or dv case, it is their birth right as envisaged by the provisions of latest women biased law enacted by the with political motivations by our great politicians.