Hello - we have 6 Buff Orpington hens, about 6-7 months old (one has been laying for a week so far). I noticed today that one has a very pale comb (a few of them have not reddened up yet, but hers is more pale than pink). She is less active, slightly lethargic or off-balance. I inspected her closely, and she had some green diarrhea on her bottom feathers but not covering her vent. They are all quite fluffy being BO's, but this one feels much thinner when you pick her up and weighs probably 1/3 less than the others. No sign of lice/mites, injury, vent issues, foot issues, eye or respiratory problems that I can tell. I don't think the others have been bullying her away from the food/water. I separated her, and gave food and water with Rooster Booster which she ate and drank plenty of. She had watery yellow/green diarrhea with mixed white. The other hens seem to be acting just fine. Does anyone know what might be the issue? I considered lice/mites, parasite, coccidiosis, etc. It seems like this just came on within the last day or two, but considering how much thinner she feels I'm not sure if she has some other illness. Thanks for any help!