[Side Note: Isn't West Virginia the ambulatory state?]

It is pretty cool.

It is difficult to give a 20-second answer to the question the girl posed, so I hope you don’t feel any scruples for your response. Given her ambulatory state, her retention of what you said is probably equally transient. (And, fwiw, you gave a good response).

I personally like the following line of thought:

To the little girl: “Priests are fathers, right? That’s right: priests are fathers. Well, can girls be fathers? That’s right: girls can’t be fathers– just like boys can’t be mothers. Boys can be fathers, priests, and girls can be mothers– mothers of children or mothers of the Church. That’s pretty cool, isn’t it?”