Jerry,
Over a year ago one of my EEs wandered into the back yard with my dogs and they peeled back an area of skin about the size of my palm. I rinsed her side out and gooped it up with neosporin. The next day she went to the vet to be sewn up. She lived in the house for a couple of weeks until the area healed up. Today she is doing fine and is one of my best layers.
Story #2- the summer the big chickens got one of the half grown babies cornered and pecked his head down to the skull. It was horrible. The pecked area was about the size of a quarter and was all the way down to the bone. There was no skin to pull together or sew together. It was just gone down to his skull. I moved him into the indoor brooder and played doctor. All I did was wash his head off with warm water to get the grit and nasty off and goop it up with neosporin. Every day I washed his head off and neosporined him. It took a while, but he ultimately was fine. His feathers grew back in a little wonky, but he's back outside running with the others, big and healthy.
Both of these experiences taught me that chickens are amazingly hardy. I thought they both were as good as dead. Instead both lived and thrived despite horrible wounds. Keep your girl warm and draft free. I fed mine lots of treats like scrambled eggs and such, mainly because I felt bad for them. The electrolytes help with a shocked system and an antibiotic can't hurt (the co-op has something called Pen-G in teh refridgerator section. It's a form of penicillin.). Just keep the area clean and neosporined and maybe she'll be okay.
good luck!