I just recently purchased a 3-week Polish chick from a local hatchery, along with some other chicks, and already I'm noticing some concerns. She seems to be much more lethargic compared to the other chicks, just falling asleep wherever she goes, in the food bowl, etc . I saw her eating, which was good, but she's missing quite a few feathers, and her poop is very watery. The other chicks seem to have much wetter poops as well, so I suspect something went on at the breeder. My only question is if she is actually sick, and what I should do to get her better?