If you can encourage her to eat something nutritious on her own like scrambled eggs or yogurt mixed with ground chicken feed and vitamins, then that is easier than tube feeding. My chickens love scrambled eggs, so they really have to be sick to reject cooked eggs.how do u force feed?
If she is really not eating, then here is a link with directions on tube feeding: https://www.backyardchickens.com/a/...ds-chickens-including-tube-feeding-techniques
When my hen had a slow crop, I took her to the vet and he showed me how to tube feed and gave me the feeding tube.