If my dog bit our neighbor, now they want to sue what can we do?

So my neighbor is 14. She was with us on the front porch with her two other siblings. She was standing beside me as my father was sitting on one of the chairs across from us and the dogs (2) were out. Now, my dogs don't bite anyone unless they are a threat to us. The girl knew she shouldn't have been bouncing around me, so one of my dogs bit her inner thigh. It was just a puncture though, so she was bleeding. She told her mother that same day, but her mom did not take her to the doctor. It has been days since then and today, her mom brought her to the doctor because the girl was complaining about how her head hurts, or her stomach hurts, or how her legs hurts (but I see her walking around perfectly). I don't believe that my dog gave her anything because one, he has all of his shots. Two, he rarely goes outside unless it's to use the bathroom, so I doubt he could've gotten anything. Also, the mother of that girl told my mother that the doctor said the girl was fine and nothing is wrong. The mom still wants to sue us. What can we do?