Can you give some more details? How old is she? Was she vaccinated for Mareks disease? I would get her drinking some fluids by holding a small cup up to beak. Vitamin B complex 1/4 tablet daily would be helpful. Electrolytes or Gatorade would be good. What do her poops look like? From the looks of her dark comb, she could be dehydrated, or suffering from a heart issue. Has she been kept from food and water by the others?