Unmarried daughter should look after her old parents who need her with them. This is a religious and moral responsibility on every son and daughter towards their parents. If the parents are in need for their livelihood expenses, it becomes obligatory on the sons and daughters to financially support their parents and fulfill all their needs.
If the parents feel sad or hurt because of their daughter leaves living with them, it becomes her responsibility to live with them and avoid hurting their feelings.
Wassalam.