If you can make some sterile saline from adding 2 tsp of table salt to each quart/liter of water, boiled and simmered for 15 minutes, then cooled. Spray or dab the wound to clean it, and trim any feathers in the wound. Then apply plain Neosporin or triple antibiotic ointment on the wound twice daily after cleaning it. A wound spray such as Vetericyn can be use in place of saline. If you can see a vet that knows chickens, that would be great. It will take some time to help heal her, but chickens can get by with only one wing.