Dream of a daughter usually is about your feelings and the way you relate with your daughter. The daughter can represent what happens in a marriage between husband and wife. The child is what has arisen from the bonding, however momentary, of two people. In dreams the child therefore is sometimes used to depict how the relationship is faring. So a sick daughter might show the feelings in the relationship being ‘unhealthy’. See: People.
Useful questions:
What are the main points of my daughter’s character, and how am I meeting them in myself?
Does the dream reflect what is happening in my marriage?
What is the state of my relationship with my daughter as shown in the dream?