I am fairly new to raising chickens. I have a barred rock that has been acting peculiar. I noticed she was sitting in the corner of the coop for a couple of days. I picked her up and noticed her vent was messy with poo. I cleaned her up and then noticed worms. I immediately wormed all of the chickens.....this was 3 days ago. Today, she is sitting in the nesting box with her back to the door puffed up. I recheck her vent and there are no worms but there does seem to be a loss of feathers. Her comb is bright red and her eyes appear clear. I have also noticed there are what looks like a small egg yolk in the nest....about the size of a lima bean. I am a loss as to what to do. If anyone can shed some light on this, I would appreciate it.