This morning I went to the coop/run to check on the hens, clean up, change water, top off feeders etc, like every morning. The girls get pretty vocal and always meet me at the door. This morning, one did not. She had wallowed out a deep indention in the run and was laying in it. She kinda rolled on her side a time or two, but went running for the scratch when I put it out with some sweet potato. She walks fine, eats well, drinks, but is kinda fluffed up more than the others. They are 19 week old barred rocks, have not started laying yet. Is this pre egg laying behavior, or maybe not feeling well. This is my first flock of chickens so I may be concerned over nothing. Help is very much appreciated.