Injured chickens benefit a lot from just being kept quiet in a darkened place, kept warm and their wounds kept clean, kept away from their flockmates & from flies. There's an aerosol bandage called AluShield http://www.jeffersequine.com/ssc/product.asp?CID=1&pf_id=16549 that can help for large open wounds that can't be bandaged or stitched. She may not have much of an appetite, or really need to eat as much while she rests & heals. Just make sure each bite & sip is as nourishing as possible, add vitamins & electrolytes to her water, give her cooked egg, but don't force feed her.
I pray that Eagle makes it! She sure will have a story to share with her flockmates!