This morning all 6 of our 4 wk old chicks looked fine. Then 1 Easter Egger started falling when she tried to walk and quit eating/drinking. We separated her from the other chicks and started giving her water with electrolytes by eyedropper. She's getting worse. Now if I set her down in her box she falls over, legs & wings straight out and she arches her head way backward. Any ideas of what this might be or if there is something we can do to help her? We're new to all this so appreciate any help you can offer.