Today has been in the -20s and the rest of the week will continue to be this cold. I noticed one of my hens today in the coop was acting very lethargic and when I touched her she couldn't move and was cold. She had poop frozen to her behind also. I brought her inside where she's been for about 3 hours now. She's drank some water and been eating but still cannot stand, walk, or hold her head up. She has pooped which I know is a good sign, I've been giving her greek yogurt, water, and some watered down feed. I'm assuming she has hypothermia but I'm wondering what else I can do for her? And how often I should be feeding her/giving her water? And also what temperature I should keep her at? Will my other 8 hens be okay tonight/why is this hen the only one cold? Anything helps, as always thanks for any advice.