I'd considered breaking down and giving an antibiotic, but I don't want to start down that road. Not only would I not be able to eat her eggs for several weeks (yes, she's still laying), but I wouldn't want to eat her meat once it was time to cull her. I prefer natural healing whenever possible, and culling when natural healing doesn't seem like an option.
I abraded the potentially infected tissue, emptied half a bottle of peroxide on her wounds, sprayed an antibacterial solution with lidocaine on her wounds, and put her in isolation with lots of clean bedding. Today I gave her a scrambled egg along with her regular feed and also added vitamins to her water. Tomorrow she'll get extra greens and possibly some yogurt. She actually seems to be doing pretty well tonight and the wounds are all scabbed over. NNs are amazingly hardy birds that never cease to impress me.