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.