My 3 year old rir is sick. It started about 5 days ago. She was alittle"off". 2 days later, I dewormed the whole flock. I hadn't done that since I got them and they are a little thin. Each day she regresses alittle more. It's like watching an Alzheimer's patient who stops eating and slowly gets less responsive every day.(I'm a nurse and have seen it in people, but not chickens). At first her crop was large and squishy, then went down to normal.I hadn't seen her "poop" in a while. She may have though.I gave her yogurt, and I gave her oilive oil(by syringe.) She picked at food, dropping most of it, listless, really not interested. When she did (or I saw her poop, it was small, formed, a slightly runny poop)(she hadn't eaten and had olive oil) Nothing in her mouth to see. I started her on Terramycin but hasn't helped. She was able to move around at first, then she just wanted to sit in the sun with her head down. I've brought her in the house the last 2 nights and put her in a cage out in the sun during the day. Once in a while she opens her eyes and raises her head like she enjoys the sun. She doesn't seem to have any pain even if I pick her up which is rarely now. Could she have anemia? Any suggestions are welcome. I know it's too late to save her, but I am curious as to what it could be. I treated the rest of the flock with antibiotics just in case. Thank you Merry