Welcome to BYC.
Are you asking what to do about that? I would suggest reposting to the emergencies forum if that's the case.
No idea what got her, but if you are asking for wound care advice, I would rinse the wound with saline/vetricyn until the mess is gone, trim the fuzz around it, coat everything with triple antibiotic ointment, and then spray with Blu-Kote.
She has a pretty good chance—chicks heal quickly, and that wound looks like it's mostly just missing skin. No major blood loss or anything.
Good luck.