See first of all I wife is ready for mutual divorce than that is best so first peruse her for mutual divorce if she doenot agree than you have to file a contested divorce on ground of cruelty under section 13 hindu marriage act in the family court and you have to prove that your wife has caused mental cruelty to you.
Further there can be chance that there are false cases on you filed by your wife when you file for divorce like domestic violence you need ready to contest same.
So I would advise you if you its better to settle with her give her alimony and ask for mutual divorce if not possible we need to contest divorce and it takes time.