Yes, I would prefer to do it outside, but yesterday it was a high of around 27*F and I thought it was just way to cold. It noticed it before sundown and it would have been dark when I put her back in. I was afraid even if I dried her well, the shock from the warm house and hair dryer she would chill. Things just got in the way today, it was warmer, but now it's dark again. She is not really bad, but I know she is going to be cleaned up soon, so hoping for a morning that is warmer so I can dry her up and put her back in the pen with sunshine.
Today I limited the treats pretty well. Just a bit of morning cracked corn (cold this morning around 21*F), then a little oatmeal before bed.
Have you tried simply cutting her a sanitary path? 3 of my 20 chickens would regularly have poop in their feathers, I had them checked for worms but they did not have any. My vet and some people on here told me some chickens just do that. I did not like to see it so I took a sharp pair of scissors and trimmed a path from their vents straight down. I did not even take it to the skin but left about half of what they had. Problem solved!