I don't know what is going on. It could be many things. Is she drinking? Dehydration can be a bigger problem than lack of food.
When I had a hen that uinjured her neck, was lethargic, and would not eat or drink, I took a medicine dropper and put some hummingbird liquid in her mouth. I wrapped her in a towel to keep her under control, sort of turned her on her back, and dropped a few drops at a time inside the beak. She gobbled it down. You can use sugar water as well. The idea is to get something in her that will raise her energy level so she will feel like eating and drinking on her own. She made a good recovery.
Good luck with yours. It can be difficult.