I would consider it a refusal rather than a regurge. I assume by swallow in this case you mean that she walked her jaw down it once rather than it was already down her throat.
What was the temp of the mouse? Was the room too cold? Have you checked the temps in her viv? Was this mouse particularly old, or from a different source? These are the questions I'd be asking.
I hope she is okay. If in any doubt you might consult a reptile vet, including getting a fecal done, just to be sure. Best wishes.
P.S. I posted before I saw the pics. What a big, beautiful girl she is!