She is a 3 (approximate) year old Rhode Island Red, and up until about 5 days ago was fine, though she hasn't layed an egg since her last molt last Autumn. The past 5 days she has been moving slowly, still out and about to scratch and peck around, but not with any energy. Today we find her in the corner of the run under the coop. We tossed her a bit of grain and she is still pecking and eating it a bit, not drinking much water that we put down for her though. I did discover a mite infestation about a week ago and have thoroughly cleaned the coop and treated it with diatomaceous earth, along with powdering the chickens with it. All our other 5 chickens are fine. Here are 3 pictures if they are of any help at all. We just don't even know where to start other than to separate her from the rest of the flock for tonight. Is a relatively small box (with holes in it of course) ok? Thank you for any help at all. .