I've had some of those too and there's really nothing you can do. If she's chipper she most likely doesn't have a serious one, and will fix it herself. I had a chick that was stepped on by her mother (a 16 lb lady with big dinosaur feet) the poor thing make a squishy squeak and looked dazed, but I brought him inside and he was walking the next day but with a limp. He's a full grown boy now and you would never know anything happened. If the vet wants to do an Xray that won't be worth it, if it's internal you can't really treat it and she will either live or won't.