Many treats cause overweightness which cause deadly infections to happen, easily, in the reproductive area of a chicken.I will try to get a pic when it lighten ups. She has been eating well. They are all on an organic diet, with many treats. It is frequently in negative temps. I would rather not share where we live, but we barely get anything above 20. In the coop, we have a red heat lamp that turns off for an hour after two hours of being on. In the run, we put up clear, plastic tarps that we use to block out wind. We also have two heat lamp and a water heater.
I highly recommend stopping giving your chickens daily treats.
Never bathe a sick chicken. Never.
Can you get pictures of fresh poop from this exact bird?