One of my hens, Rosie 7 months old, is lethargic and not moving. Seemed to start 2 days ago. Normally she is the first one out to greet me, very friendly and vocal. Today when I went out, she is laying in the run and won't move. She opens her eyes but just barely. She seems to just want to sleep. I tried to get her to stand up and she just sort of falls to the side and lays down. I tried to feed her some scratch (which she loves and will normally eat out my hand) and she has no interest. Her poop may be runny but I can't say for sure. I palpated her belly and couldn't feel any retained eggs. She had started laying about 2 months ago and layed for a couple of weeks and then stopped. I thought it was insufficient light so I increased the time the light was on but she never started laying again. I have 3 other hens that are about the same age and they are behaving normally. I am new to raising chickens and I don't know what to do. Any help would be much appreciated.