Yes, her feathers will grow back. Sometimes on the head if the skull is exposed, they won’t always, but most chickens with these wounds on the back will granulate in gradually. If I can find a couple of recent threads, I will post some pictures. If you can post pictures of her at different times it helps others.
If she doesn’t eat vety well, you can offer some of the foods that Shadrach listed, but most chickens will eat eggs when they won’t eat food. You may also wet her feed to get more fluids into her. Does she appear to be in shock?
If she doesn’t eat vety well, you can offer some of the foods that Shadrach listed, but most chickens will eat eggs when they won’t eat food. You may also wet her feed to get more fluids into her. Does she appear to be in shock?