I'm not sure on what to do but I think I saw something about a warm water bath. look it up. Good luck.
Thanks tjordan, her bottom is slightly swollen and not eating much, I took her inside the house for few minutes when I got home @530pm, she ate some bread and had water I put her back in the coop turned on the emergency heater since its dropping to 0*F high of 9* just to keep the temp 10* higher and her comfy. I normally don't turn the heat until -10 to -20.