My Sebright Dotty has had a tough life so far, two other chickens in her flock got taken out by predators and she was left all alone. We found two new chickens for her from a guy on craigslist, but I'm now questioning if they might have had some disease. The other two have pretty much stuck to the roost, and I figured it was more to do with being new to the coop. But they all have their feathers ruffled out and tired eyes sleeping a lot. And now Dotty is behaving in the same way, but she also has been crying out making a really sad noise. I'm new to chickens and not sure on diseases, either treating them or if they recover on their own. I did get a video in case that helps anyone identify anything. Thanks for the help!