The most important thing you can do is make her comfortable and make sure she drinks. Get a dropper and Gatorade. Make a mixture of half water and half gatorade. Use the dropper to slowly 'droop' the water onto the side of her beak. Don't force it so it won't go into her lungs. After each drop she hopefully will swallow.
Make her a scrambled egg and smush it really fine and see if she will eat it.
Try your best to give us more information about what is going on with her like how she looks, where she is housed and with how many other chickens. Are her eyes clear and bright? How is her breathing and are her poops normal. Things like that.
