I have a 23 wk old BSL hen who, about three days ago, started to slow down. She was roosting alone all day, sitting alone while the other birds run for treats, not scratching etc. Her poops are white/yellow and runny but not watery. Her crop is soft, but seems plump. She is just getting more and more sluggish. Her feathers are puffed up and she doesn't resist when I pick her up. She feels light and has a clear runny nose w/ no bad smell. She couldn't get onto the high roost bar last night and I had to lift her up there. All the other birds are fine. I have her isolated, and she did drink water when I offered it to her. I am making oatmeal for her now. Update: she is also not eating and refused the oatmeal. Does anyone have any idea what this could be? It doesn't seem to be respiratory, and I am afraid to give antibiotics without any minor clue as to what I am treating. If she slows down anymore, I am afraid she won't make it.