Didn't they establish a couple of times already that Hanako's the most booksmart of the three? Olivia's supposed to be the dumb one, though it is easy to forget this, even Kasumi did at some point.
A refreshing reminder that Hanako's pretty talanted despite being so dimwitted. Don't forget: she was also the ace of the tennis club. Wisdom and Charisma were definitively her dump-stats.