Thank you for all the help. Little Katie seems to be doing much better today. The swelling in her breast is way down from yesterday, she is alert and chatty today again so I am taking that as a win. :0) I returned her to the small brooder coop with the other chicks this morning, as I don't want her to be apart from them for too long. I was hoping since they are so young that the pecking order will be easier for her to adjust to. No one from our area has claimed her or seems to know where she could be from so I guess she is staying, which makes my daughter very happy.
My question now is what breed and age do you think she is? Majority says Leghorn, I am thinking maybe 4 weeks??