How old is your hen? Was she vaccinated for Mareks disease? I am just asking in case this is something more than simply dehydration and lack of food. Casportpony is an expert on tube feeding. Do you have any large syringes or pieces of plastic tubing, such as a piece of aquarium air tubing that could be used for tube feeding? I purchased some from Walmart pet fish section, and melted an end to soften sharp edges. This tubing will fit the end of a regular tip syringe. This works well for tube feeding fluid, but is a little small for feed. Inserting the tube into the back of the chicken's right side of the throat (your left if facing the chicken,) will avoid the trachea or air way. There are good instructions in Casportpony's thread " go team tube feeding."