That's a great resource.As long as infection does not set it, birds can heal up remarkably from some pretty severe wounds with time and supportive care. Here is a link to a long article on the healing process, what they did, with pictures, which may help you along the way. Best of luck!
http://richie-cunningham.com/2012/04/11/chicken-wound-healing-process/
@sunetc - the wound in this article is very close to the one you are dealing with - which is worse than I had pictured - IMO, I would follow the cunningham method for your gal.
I have no experience with a wound like this on fowl, but in humans a large severe equivalent wound will heal and regrow skin with time as long as it is kept clean and you deal with any infections.
Please keep us updated, and keep up your TLC for her.