I'm so sorry. Do you think that she was hurt or maybe severely dehydrated? Some neurological diseases come to mind. Botulism, from eating a toxin in dead animals or rotted vegetation, mold toxin from mold in feed, or Mareks disease can cause similar symptoms. Do you know if she was vaccinated for Mareks? Will she swallow some water held to her beak with a spoon or dropper, just a drop at a time so not to choke her? If she dies, I would refrigerate her body in a plastic bag, in case you want to send herin to your state vet for a necropsy. Please let us know how she does, and I hope she gets better.