Need help immidiately!!!

I found one of our little chicken in a terrible state. She got stuck somewhere and the bigger oned picked on her.

Trigger warning!

She is still alive, but basically her skin was removed from her head. Her skull is exposed. I'm not sure if I can even help her to survive. But she still breaths, can stand, walk a bit and her eyes didn't got hurt.

Is there anything I could do to help or we should just let her go and make the suffering end?

(I can send pics in private, not sure they would fit here...)