Has she eaten anything for the last few days? I would suggest giving her some nutri drench in her water and trying to entice her with some scrambled eggs right now. Have you checked her for injuries? Possible infections? With the information you have provided there aren't any obvious...
What’s her diet? Does she still lay eggs? Have you checked her over for mites? Have you considered a vitamin deficiency? Can you attach pictures?
@Wyorp Rock @azygous