who else thought the last episode was a cliff-hanger?

She probably becomes a Wonderbolt much later, the academy is probably just a way to teach pegasi the way they train. I assume she completes her courses and studies, its something she's trained for her whole life. The people at the academy could either get the balloon fixed, or bring Twilight and the rest back home by taking them on a pegasus drawn chariot. And seeing as the care package was from Pinkie Pie, it has to be baked goods of some sort, maybe a cake.