Off the cuff to make u cheer up saying these;
1. Marriage is like "management" so apply basic fundas of Druker to what nots into your marriage since u r CEO as per your ID Im sure things may work out.
2. Im not sure what things your MIL is injecting about your parents and also to whom so no gyan on this sentence?
3. "Can LAW help me to force my wife to stay with me?"
Law says that a couple should live together always for which Law reconciles differnces of them, sends them for counceling, hints for mediation and if all these fails then advises on MCD and if this effort also fails then couple contest basedon points of Law and end of such IPL match, one party win to loose all those golden years with a emotional baggage till next button he / she hits so Law is helpful only upto that extent and it is only a wise couple who resolve or amicably split is the morale of story.
4. "Our marriage is not registered can i file a divorce?"
Based on Jurisdiction and cause of action yes you can file for divorce only if you want to follow that path and from LCI databse you may seek helps of wise divorce advocate(s).
5. "My daughter is a new born how can i get the custody of her?"
If conduct of your wife is on extreme side and on day one of hearing you can show that conduct then the daughter is all yours otherwise "wise parent = Court" says that wait till she is 5 years old and gives you a lollypop of visitation till then. See where you as a wise natural guardian like ot see next years.
6. "How can i save myself if my mother in law files a case of dowry or violence?"
Colelt evidence of your innocence. Start with lovely neutral love letter to your wife askign her to join matrimonial home, follow this with sending regularly her some money for her and child's upkeep and so on so forth.
7. "I can share more details if needed. Please help?"
You are welcome to share only if you think it has come beyond a point of no return, since you are now blessed with a lovely daughter think of her too while making wise decisions.
ATB, Rgds.