Hi everyone! This is my first time with a sick chicken so I'm really not sure what to do. My hen is almost 2 years old and has started acting very strangely. While the others peck around outside, she stays hunched in the coop or stands in this very unnatural looking straight-up position (see picture). She will drink water and eat a bit, but when she walks she kind of staggers but in the same sort of straight-up position. When I turn her over I see a lot of poop caked to her feathers. It's hard to clean because it's been very cold here and is frozen to the feathers. I have inspected her vent but it looks clean. She hasn't been laying but I assumed it was because she was getting older and it's so dark all the time now. Can anyone help?? Thanks in advance!