Triple antibiotic or Neosporin with out pain relief, if you use Blue kote you'll have to dab it on to keep it out of her eyes. And keep the drakes away from her till she is completely healed or better yet keep her away from the drakes period her and any other females you have, Looks like gang rape to me.Oh yes, male ducks can do serious damage and death can result as well.
Does your duck have a bowl to dip her bill into (1"-3" deep)? If not, she needs it. I think I would be inclined to carefully use straight saline solution to flush that eye- (Like the kind that is used for contact lenses). But if she will attempt to bathe on her own then you might not need to very often. I think I'd get Blu Kote around it and on the neck, but absolutely not in the eye.