I hit a dog once in a 200sx I used to own. Damn thing went flying down the road, got up and ran away. I chased after it because I wanted to know who owned it in case there was damage to my car but the flipping mutt got away. Fortuantely, other than depositing a load of hair around one my fog lights there was no damage.
Glad to hear that the girl was OK I can't think of anything worse than doing some serious damage to a pedestrian in my car, especially a child.