We have a white leghorn hen who is just under a year old. She's been a great layer and the leader of our flock. Almost a week ago she laid a soft shelled egg. We didn't think much about it but the last few days she doesn't seem to be herself. She's still eating and drinking but her comb is a little floppy and she seems a bit lethargic. Plus she hasn't laid any eggs since then. Her poop is normal. Anyone have any idea what may be wrong with her?