I just picked up what I think is a white leghorn from the local humane society, (they didn't have the ability to care for a chicken). I'm unsure of her age. she is very pale in her comb and I cant get her to eat or drink anything. she's preening a little but otherwise not active. very strange stool as well (light tan and gritty). need advice on how to help this poor old girl start to feel better. I will eventually introduce her to my flock after maybe a few weeks to a month in quarantine but need advice on how to help her recover. any help would be great!