I got her and another Sussex, as well as a couple Welsummers, from a breeder. They are being fed medicated chick starter. Day 3 being here, she started acting lethargic. She wasn't eating or drinking much. Day 4 I brought her inside and started treating her and everyone else with Corid, figuring that made sense even thought I didn't see any bloody poop. After 4 days in the house in my kennel / chicken hospital she was bouncing off the walls, doing great. I put her back with the other 3 and she was doing fine for about 10 days. Then she started acting the same. This time I saw a little bit of bloody poop. I put them all back on Corid Sunday 21st. Also giving Save A Chick electrolytes. She has good days and bad. Yesterday she was huddled in a corner, tail down, puffed up and peeping. It was 96 degrees and humid. Their coop and run are in the shade and they have a little over 50 sq ft not including the coop itself. It's all portable and I move them to fresh grass every few days. They have a good sized coop with plenty of ventilation, 2 roost poles and wood shavings for bedding. No one is picking on her. This morning she was huddled in the same corner, doing the same thing. I refreshed their water and food (they get fresh water and food twice daily) and she ate and drank readily. She's not off her food, but she's not at all active. She'll follow the others around and then just hang with them, tail down and peeping. She's been vaccinated for Mareks. I'm not seeing any more blood in her stool. She walks normally, not off balance. Her eyes look bright, but when she sits huddled over she has them closed. I'm at a loss. I have 3 other 4 yr old hens, but they're not cooped with the pullets. I am treating one of these hens for bumblefoot currently, if that makes any difference. What else can I do for her? Beginning to wonder if I should cull her or keep fighting.