1. In matrimonial dispute of irreparable nature it always best to end the same by way of mutual divorce.
So convince her to do the same , may be, in lieu of permanent alimony.
2. Explore the first option only if the marriage is not going to work at all.
3. Yes, she can file case for dowry harassment and other charges. However once you get bail, you need not worry much.
4. The contested divorce suit does take time in India and if you could prover herr mental tortures you can get divorce.
5. Before doing these things I would strongly recommend you to give your marriage one final try.