Is it injured? Was it predator attack?
Is it showing any other signs of illness? How is it's poop, crop, eyes, beak, etc.?
Did it get into something toxic? Did it's feed get moldy?
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Inspect her feet. Wipe them clean with a wet wipe if you have to. Check toenails, gently move her feet up toward her body. Do her toes curl into a fist or does one of them appear to not want to close, if so there may be a broken toe involved
Try to get her drinking liquids and offer feed with a little water added, and some scrambled egg up to her beak. Was she vaccinated for Mareks disease? Can you see any swelling of her legs or joints, or any sores on her foot pads?