What did the instructors recommend for her? If she was riding well and simply screwed something up on the test they may have told her to come back and take the test again. If she didn't quite have the hang of it and struggled the whole time they may have told her she would be better off starting again, or starting the second day again.
In defense of the instructors, they were probably doing the best they could with what they had. Riding for 12 hours in a day sucks, but it doesn't suck as bad as riding in a blizzard, or not finishing the course because you have to work on the make-up day.