I'm so glad she is doing better. Keep pails of COOL water NOT COLD in yard during extreme heat,in the event of heat stroke submerge chicken up to neck in water,this will immediately cool her body temp. down and save her life. Chickens do not have sweat glands,they rely on their respiratory...
Has she had any water today? If not,she has to have water otherwise she will become dehydrated,start there. What is the temperature there? Any other symptoms besides her dirty bottom? Has she been eating? Do you feel she has injured herself coming out of rubble?