@Darkmint13
Time skip of hours/days. (I for one don't believe the royal institute is that near. Then there is the whole dressing up thing and gathering the audience thing. I would say all of it together would take several hours at minimum. Normally enough to recover "stamina". There is also the fact that the prince healed her. )
Incidentally, the lacking information is "Everything regarding her magic" which includes how taxing the magic is (is it equivalent to running a marathon or is it just like writing? From what energy pool does her magic come from?)
and also "Medical/physical knowledge" such as how much rest/food an abused child needs to have before regaining the necessary 'health' (mental or otherwise) needed for strenous(?) activities. I sincerely doubt a magic fantasy community have the sufficient knowledge on how to deal with abused children.
If I had a complain about their conduct it would be "FEED HER FIRST YOU DUMBASS! SHE JUST TOLD YOU SHE EATS SEEDS FOR MEALS!"