I'm not sure. Maybe you should check her leg and her foot to see if some splinter is there, or if she has a small cut on her little foot. Just make sure to ask the people at your farm store what they would recommend. I hope that she will improve!! I think that the laying on the side thing is...
It could be coccidiosis. Take a trip, as you said to your local vet or farm store to see if they have any advice and/or medications. I hope your little chick gets better soon!!