I live in Wisconsin, and the temps are brutal right now. The next week is forecast to get down to -20°F. My wyandotte is less than a year old but a sudden one-day freak daytime high of 46 got her thinking about babies. No rooster in sight. She's one of my 12 backyard city chickens and is hogging the queen suite nest box. I want to do the broody breaker metal cage with her, but I'm worried about those plucked feathers. Will she get frostbite? I'm in a real pickle. I'd get some hatching eggs or something for her but I m already at my legal limit for city chickens. Any advice would be greatly appreciated.