What all has she eaten today? Have you thought about tube feeding? It may be necessary to give her the strength to eat on her own. Call some vets and ask if they can sell you a tubing kit for a small animal.
Are you syringing fluids? This is how to do it safely without getting it into her airway and choking her. Notice the airway in the center of the throat behind the tongue. Avoid that. Slide the syringe into her left side of her mouth, going slightly under the tongue. That leads to the crop.
You...
Is she drinking on her own? That's more important than food. If you put sugar in the water, it will elevate her blood sugars just as food does, and she won't starve.
Your hen is very sick. Chances are she is dying, and dying chickens do not feel like eating. Continue for the rest of today...
You want to use a sterile saline wash for treating all wounds as plain water will cause pain as it upsets the ph balance in the injured tissue.
You can buy it where the bandaids are. Or find a recipe on the internet and make your own.
To clean an ear out, use a Q-tip with most of the cotton...
Regardless whether an eye has been injured or is affeced by an infection, it needs to be treated by flushing with saline eye wash and then treated with an antibacterial ointment.
If the eye is black, it's been bleeding. She will likely lose the ability to see with it. It still needs treating to...