I agree with Buzzard. I would stick with mice. I have heard of other Corns regurging after being fed rats. One was an adult corn, that had never regurged, & regureged after the person tryied to switch her to rats.
IMO there's no need to switch Corns to rats. Adult mice are the larges prey they really need.
Another problem with ASF's is htey're harder to come by & therefor, more expensive. You could try to raise your own, but they're nasty little buggers. LOL
Like I mentioned in my first reply, I would feed small meals, every five days. Get the NutriBAC to add to the prey (& the water, if you want as well-but be sure to change the water out daily)...be patient, as mentioned, you want this one to recover, but not too fast. You could cause more problems if you rush her.
If she's keeping single pinks down, you can probably move her up to 2 pinks for a few feedings.
If she's keeping the pinkies down after a few feedings, you can try moving up to fuzzies. Be sure to put the slits (or wholes) in the prey to allow for easier digestion.
*You definitely want to wait a good 10days after a regurge. It's pretty hard on their system.
You can wash the prey with dawn dish soap, to get rid of the mouse smell. That might help as well.