Compensation from Husband

Respected Sir, My wife's elder sister has got disputes with her husband. They ended 25 years of married life. Her husband without she is consent, she has sent to her mother's home, she is 45, last 4 (four) years she is away from her husband staying with her father and mother. her parents has no earning and having poor financial situation. Her husband is engineer and earning rich salary INR1.50 lac monthly in NLC (public sector, government undertaking company), Neiyvali, Tamil Nadu. He is asking divorce from her, so she has moved to court and ready to give divorce and she sought proper compensation from her husband. Last four year he did not give any compensation. Last one year she has got breast cancer too, this also happened due to her husbands mental torture only. And husband lastly ready to give Rs. 10/- lac in out of court settlement. But as a relative of we, saying that its not sufficient for her residual livelyhood. She seeking 20 lac for lumpsum compensation and Rs. 15000/- monthly pay from direct to her bank account from the public sector company. Sir, Can you help her to get good compensation please.