Just wondering so we know how to help the best...I have done my research and have owned chickens and raised chicks for many years, just so y’all know, I’m not completely coming out of the blue for caring for chicks, I just never had one like this and there a few different things it could be and I need y’all’s help.
So maybe separate her and keep her warm. Wait a while to feed her anything else to see if the crop goes down. And the drainage stops.
Once you do offer more food water offer electrolytes and maybe give some nutrients drench. If needed soften her feed also.