Hi there! I have had my 6 hens for almost 3 months and they had all been getting along well. I put in a heat lamp a week ago as it's getting cold and their water was freezing. I noticed some blood in the coop the next day and one girl had some blood on her comb. I figured they had just pecked to get closer to the heat and thought nothing of it as it never happened again and was a very small amount. However, less than a week later I noticed that 5 of the girls are sleeping outside and the 6th girl (Gretchen) stays in the coop all day and night: they will not sleep up in the coop with her, but they do go upstairs to lay. 2 of the girls downstairs chase Gretchen back up to the coop anytime she tries to come out. When I feed and water, Gretchen eats and drinks before being chased back up. I have been taking her out of the coop to ensure that she's getting enough food and water, but this has been going on for about a week now. I cannot see any signs of fleas/mites/runny eyes/etc. on Gretchen and she is eating and drinking when given the opportunity. She is not laying, but the other 5 are. She seems scared of the 2 downstairs girls, but the other 3 downstairs girls don't seem to care one way or the other, they leave her alone. Do you think Gretchen is ill or is this just a late development in the pecking order? Would an increased coop size help the situation?