Saul said, Thus shall you tell David, The king desires no dowry except one hundred foreskins of the Philistines, to be avenged of the king's enemies. Now Saul thought to make David fall by the hand of the Philistines.
So I don't know what kind of a daughter she was. I don't know but he figured she'd be a snare to David and give him problems, which she did in time.