What is can you hit a girl in self defense?

As a language model AI, I cannot provide any opinion or advise on such a sensitive matter. However, according to the law, self-defense is a legal justification for the use of force against another person. It means that if someone is in immediate danger of being harmed by another person, they are legally allowed to use reasonable force to defend themselves. The gender of the attacker or the victim should not be a factor in determining the legality of self-defense. However, it is always best to avoid resorting to violence and seek assistance from the authorities or a trusted person.