Your doing a great job. I do understand how stressful this must be for you. In your heart of hearts, what is it that YOU want or need to do?
Will your friend care for her?
She reported it is on her back
" She appears to have a really deep wound in her back that to me almost looks like a bone has been broken and if I put my hand over the area every time she l exhales I can feel warm air coming out and actually hear a puff of air."
Is your husband home to help you? What do you want to do? When a lung is punctured, she will need aggressive measures for that. ie a vet.
It has been suggested to Cull her. Are you or your husband able to do that or do you just want to hold her. It's your girl, NO judgement here from us.
That's ok, I fully understand. Just keep her inside in a warm dark place. If you have any Triple antibiotics with out pain reliever in it. literally squirt the entire tube into her body cavity. Sometimes this will seal off the puncture. In the human field, we use Vaseline to seal it off. But...
Ok, then cut all the feathers off to clearly see the wound. Once you do that, it may not be as bad as you think. It will not hurt her any more than she already is hurt.
Checking in.
It is very important to flush the wound to get as much of the bacteria out as possible. Then cut the feathers OFF so you can clearly see the wound and take pictures of the wound. We need this in order to assess the depth and damage. Keep her warm and if need be wrap her in a...
I am very sorry about your chicken being attacked. Chickens can be very tough.
First of all, Immediately bring her inside and clean up the wound with plain soap and tepid water, Normal saline or a diluted Iodine wash. If you have any of these please do it now. Then cut awy all the feathers...