Victim forced to stay with husband after abuse

I know a woman who has been married for 6 years. She has been physically and sexually abused by her husband. She has left her husband and went back to family, but every time was sent back to her husband as they belong to low income range. The violence happens again after return. This time she wants to file a divorce, but her parental house doesnt want. Moreover her husband has threatned me not to help her and also threatned her that with nowhere to go she will return back to him and he will ensure this time that she doesnt come in contact with outside world. The abuse and violence will continue. The women wants to stay away. Is it possible she lives Delhi and settles in some other place. Can she file a divorce case in the new place. She cannot file a FIR now as her parental people are not allowing. How to help her out of this? (Religion : Hindu)