Husband wants Divorce and wife isn't ready to give divorce

Hi, I have been married for 3.5 years now. My wife has temperament issues and because of which she keeps on fighting with everyone. Her parents involvement in her life is too high. I have tried my level best to change her but all in vain. We keep fighting almost all the time because of her temper. Finally I told her I do not want to stay in this marriage and want a divorce. She still stays in my house and is not ready to leave it. She is not even willing to give me divorce. We dont know what is to be done.We consulted a few lawyers and all of them said you can file a case under Mental Cruelty. However the same is gonna take a lot of time minimum 5 years. Her parents are dominating and not ready to resolve the issues as well. Worst is that she has no friends and her family has broken relationship with all the relatives. The major concern for us is that if we initiate the divorce they might file a Domestic Violence case or a Dowry case and ruin mine and my family's life. How do we take precautions for the same. Please guide what steps should be take so that we can be free.