How would a little girl feel toward her father?

How would a little girl feel toward her father when she is told that her birth mother is a surrogate mother, and she never had a legal mother? This legal contract was made before she was conceived. She lives with her daddy full time and the only other family she has is her grand mother and grand father, who she sees every day. Her father never wants to get married or have a girl friend of his own. Al he wanted is a child of his own. She knows that her father loves her very mutch and is very glad that he has her, wants to be the best father she can have, and wants her to spend most of her free time with him and her grand parents.