You may want to read some about tube feeding in case that is something you would want to consider:
https://www.backyardchickens.com/threads/step-by-step-tube-feeding-guide-pictures-under-construction.1064392/
Wet chicken feed made into a mash is sometimes eagerly taken. But if she is still...
I would start the vitamin E that Wyorp Rock recommended. It can help with neurological symptoms of head injury. A bit of egg daily can also give selenium which helps with vitamin E uptake. We are not vets here, just chicken owners as you are, so we can try and help you as much as we can. It is...
If you add water to what she eats, that is a good way to get fluids into her. I kept a hen alive once when she lost her balance for about 5 weeks, just putting water into her chicken feed, eat, and making everything watery. She refused to drink, but ate very well. Suddenly one day she could...
Some people use baby food, but I would feed watery chicken feed or mash and a little scrambled or boiled egg. If they refuse those, I will try canned cat food, ground meat, or tuna. Then go back to the wet mash once she started eating.