Is there any chance that the rodents you are feeding her are a little bit too big for her?
I had a male boa, he would eat like there was no tomorrow. I had him on weanling rats and thought maybe it was time to move up. Now the difference between the weanling rats, and the small/small rats I was feeding was not much more than a few grams. However it was too much for him to handle. He'd soak then regurge the small rats.
I was in the same situation, vet check/fecal all that stuff was perfect.
So on a hunch and at my wits end, I gave him 3 weeks to heal from regurging and went back to weanling rats. Never had a problem again. I just waited another 6 months to change to small rats , and he did fine.
Like I said it wasn't a huge difference in size, but just enough to make him regurge.
So I would maybe give her two weeks to heal. Then try a smaller prey item and see how she does.