So sorry about your chicken. Those wounds look pretty bad. I am not sure that you can save her. I would spray the wounds with Vetericyn and apply plain Neosporin or Triple Antibiotic Ointment twice a day. Has she eaten or drunk any liquids? Is she able to stand or walk? Aspirin 40 mg can be given orally once or twice a day up to 3 days for pain. A vet can prescribe meloxicam for pain. If she seems to be suffering, I would consider putting her down.