I noticed yesterday that one of my 1+ year old hens is acting a bit off. Her crop isn't enlarged, I haven't been able to catch her to examine her better. But she's a bit lethargic, distant, not wanting to forage with the rest of the flock. Stands by herself away from everyone, just standing there, a bit fluffed up. At first I thought it was because she was fed up with the crappy weather, lots of rain and a bit colder in the evenings and days. I gave them all probiotic yogurt yesterday and vitamin water. which she ate. Today she's still the same. it started to rain, so she went back to the coop and flew up onto the roost , while the others braved the weather. would it be a good idea to treat with sulfamethatizine? even if it is not cocci or coryza ?? should I deworm her? is it safe to do both at the same time.?? she didn't really moult like the other girls did and she hasn't started to lay again. But, it is winter, and I am not giving extra light, so the laying has stopped and slowed for the other girls. the other hens are all healthy. so I am wondering if she is maybe egg bound or laying internally. they free range for a few hours everyday, have access to grit. what to do?