You may want to make her a chicken sling or chair to get her up and in front of food and water. Here is a good link with pictures:
https://www.backyardchickens.com/threads/versions-of-chick-chairs-please.1166308/
In the pics, there is something weird about her comb, and her left foot is curled under. Does she relax the the foot, and does she move both legs and stand? Do you have other chickens? With weak or sick chickens, offering cooked egg, chicken feed made wet with water, tuna, sunflower kernels, or...