Can you find the crop and check if it is intact? It should be partially full if there was food in it before the attack? Will she drink water when you hold a lid or cup up to her beak? Check to see if any is leaking out of her crop. If the crop is intact and not leaking or open, I would try just treating her wound with chlorhexidene, saline, or Vetericyn, and then apply some plain antibiotic ointment twice a day. Keep her away from flies.