1. Unless any harm was occasioned to the husband of your aunt by the act of the latter to indulge in black magic, the former cannot seek divorce on this ground.
2. Furthermore, an isolated act of indulging in black magic is not a ground of divorce for the husband of your aunt.
3. Your aunt should contest the divorce case as and when her husband files it.
4. Your aunt can file a case for domestic violence against her husband to remedy the abuse suffered by her. In the said case she can claim a protection order, maintenance and monetary compensation against her husband.
5. If she has been harassed in relation to dowry then she may even file a criminal complaint for dowry against her husband.
6. The above being said, she has no rights in the property of which her husband is the owner.