The white urates in her droppings may be due to dehydration. Has she been able to drink at all since the attack? Water with electrolytes or just palin water offered with a scoop might help if she can drink. Some large animal vets might be familiar with chickens. Have you had any problems with worms or gapeworms? Do you worm your birds occasionally or have any SafeGuard Liquid Goat Wormer or Equine Paste? I would hate for you to rush out to find those since she is in such bad shape, though. It is hard to know if the stress of the attack has called something to happen, but I think that an injury if probably more likely.