We have a hen about 3 or 4 y.o.. Today I noticed she is lethargic, puffed up, and moving verrrry slowwly..also when sunning with the others she did not seem to want to lie down. And her tail is down. I also noticed that she went to the waterer but when she got there she suddenly lost interest in getting a drink. I caught her easily (bad sign) but she did try to bite, peck, and get away from me, a good sign. She is eating. Could this be cocci? I noticed some blood on our front porch a week or so ago, and also THOUGHT I saw some blood in the barn one day, but just wasn't sure, but in both cases it did not seem to be bloody poo. Our flock is free range and the rest seem normal and healthy (knock on wood) but I did notice some unusually runny poo (from someone) outside the barn, but no blood in it. Weather has been very cool and rainy for weeks, finally has warmed up to moderate temperatures, with sun the past couple of days. Any help would be greatly appreciated, we have a lot of young chicks.... I have the sick one isolated from the flock, in a pet carrier, but obviously she has been with them before today.