I have a 5 month old bantam cochin pullet that is not acting like she normally does. Tonight when I went out to turn the heat lamp on in my coop I found her standing under the perch by herself while the other chickens are roosting. When the light came on she began scratching and eating out of the feeder, but didn't want to go perch with the others. She is kinda standing more upright with her wings farther down than normal. She also has her neck pulled in and her feathers fluffed around her neck. I don't think she has ever laid an egg. Her poop seems to be kinda yellow/brown and slightly runny. Does anyone have any idea what I should do?