Away from the World Cup, Hosszu shows up at practically every meet which offers prize money. There are a few swimmers, like Michael Phelps, who've made more money from endorsements. But no one else has ever won as much prize money.
This is how Hosszu looked when she was at USC:
This is what she looks like a year after turning pro:
Your guess is as good as mine as to how she effected that miraculous transformation.