Guideline Regarding Divorce from Husband on Ground of Cruelty

My sister needs Divorce from her Husband on the Ground of Mental and Physical CrueltyMy sister got married two years ago and she has no children, and now she has been living with father for the last 6 months. She is continually facing problems from her husband, and she decided that it is impossible to stay with husband and need divorceOur family requested her husband for mutual divorce even without maintenance like that, but they are not ready for that. nnKindly guide now how she can get divorce as early as possible. I know that it is not possible very fast. Whatever kindly suggest the best path in the view of CONTESTED DIVORCE step by step (In details of rules and act etc), So after a certain time she will definitely get a divorceHer husband is financially fulfil, also guide, can we file petition for maintenancenOr Interim Maintenance or any kind of etc. nnAlso guide can she file a complaint on husband on the Ground of Mental and physical Cruelty, if yes then guide in details