2 yr old hen, RIR mix, penned in large coop (outside dog kennel) with run that size again. Fed laying mash, scratch feed, and given time to free range every day. Has 8 other friends, 3 are roos. (too many, am working on that). Presented Weds with listlessness, not wanting to eat, hanging around nest boxes, possibly to hide underneath. Allowed me to pick her up, very unusual. No outward signs of anything. Only one hen laying in coop, last egg has been a while now due to weather. Very tender in belly area, if pressed, hen squats/falls. Nothing felt in external or internal exam of vent area. Hen walks into obstacles, and has only occasional menace reflex. Not eating, but is drinking some. Wanting to either stand or lay down. No runny nose, no sneezing or coughing. Poop is looser than usual, and is green. Diminished amount of droppings, but hen isn't eating either. All ideas welcome, have given hen vitamins and electrolytes. Thank you! Edited to add: hen is pictured in my avatar.