Personally I'd give her a soak for about five minutes in a dilute solution of povidone iodine and water at about 90F. Make it up so it looks like really weak tea. I'd probably soak once every 3 days for maybe 2-3 times. That iodine is super safe for all animals, even for really deep wounds.

That's one reason I never like to feed live, too many bad news stories about snakes getting bit or losing an eye. If you need to feed live I'd suggest using a rat pup, one with the eyes still closed, should be about the size of an adult mouse and would be totally harmless. In fact that's probably the only rodent that I'd trust non supervised, could probably even leave it in there overnight. For my small king snakes I use live pinky mice and just put them in the tub in the evening. In the morning if they are still there I move them to another snake or put them back with the mouse mom. How many times did you try pre killed? Typically I can feed live once or twice and go back to prekilled and switch them over fairly easy (with a new snake). Once they have a few prekilled under their belt they are hooked. Frozen thawed is tougher in my opinion. It's hard to get a consistent fresh rodent of the right temp and smell. One bad frozen thawed and they can go off of feed for several weeks, one of the reasons I switched to all fresh killed rodents.