1. Wife is entitled to claim an amount from her husband to maintain herself as per the standard and status of her husband. If her income is less than the required amount then she can claim the balance amount from her husband. Moreover, she can argue that she is not earning any salary. what sh is getting is fellowship paid for pursuing her studies.
2. She should file a DV case and seek maintenance from her husband filing a separate application raying for interim maintenance which will be granted within a very short period of time by the Court.
3.In the DV case, she shoud also pray for right of accommodation from he husband.
4. However, it is to be kept in mind that no Court can force her husband to join him and continue to have conjugal relationship if he does not wish to.
5. If he files a divorce case, your daughter can contest the same but in reality there may not be any married life. Under such circumstances, it is not considered as a bad idea to mutually terminate the relationship and start lives afresh.