While the students are swimming, Kylee takes the opportunity to relax, dressed in a bikini, watching the other swimmers floating on an inflatable mattress.
Kylee explains to herself that she doesn't need to swim, being above everyone else, being the best, and that being at their level would be insulting. Not to mention that her father funds the school and can therefore cut its funding and close it at any time.
So the school is forced to obey the whim of this obese princess.