When you take her to the vet, be sure to get some flagyl. This helps kill parasites and also helps recoup from regurges.
Next meal needs to be 2-3 weeks from the day you found the regurge. Offer a smaller mouse than usual. Once she eats and it stays down, offer same size again in 1.5-2weeks. As she keep them down slowly move up in size and frequency. Go to fast you will cause her to be a constant regurger. Slow and steady will get her back on track.