Let me tell you a secret: many daughters challenge their fathers too. They’ll dive into a power struggle with you, not to see how tough you are, but to see how much you really care about them. So remember that when she pushes hard against your rules, flailing, crying that you are mean or unfair, she is really asking you a question: Am I worth the fight, Dad? Are you strong enough to handle me? Make sure she knows the answer is yes.