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This sort of repulsion is related to childs psychology;there should be some strong reason for it:-
-children at this age don't like the people who scold them at every small thing.
-If it happens that her father touch is felt very rash
or he has hit the child.
-If your child is attached more to you & she has seen her father fight with you.
-Please don't feel bad but if the child has seen you & your husband in a compromising position & felt that he is harming her mother.
-The child feels neglected when you give more attention to the father .
These are few possibilities please try to talk & get her to share or better consult a child Psychologist