I have a hen that is about 3 1/2 years old. She is acting weird. A couple weeks ago she had feces stuck to her tail feathers. I cleaned that off. She has that again. She also had and still has puffed up feathers on her neck and head. She seemed like she was doing better for a few days. She hasn't been perching the last couple nights with the other girls. In fact last night I had to put her in the coop with them. This morning she was next to the door puffed up with her head tucked back in her feathers. When I have given them chicken scratch the past couple days she's been eating it. I work during the day so I'm not able to watch her all day to see if she's eating or not. . Her eyes and nostrils look fine. It doesn't feel like she has a full crop. . The other hens aren't picking on her yet but I think if she keeps acting this way they will. Any suggestions would be appreciated