I wouldn't use the checklist as supporting evidence for what you're trying to suggest. Many people would attribute those types of lists to Te usage. For that matter, that list was comprised of her personal, subjective perception of how to make friends or make them smile or whatevs. The list was her external checking point, but the things on the list were completely subjective ideals that were proven helpful from her past experience. So not only am I suggesting that she seems to be an Fi/Te user in this particular episode, but I'm also suggesting that she may have also relied on Si to come to the conclusion that her method was effective.
That aside, as suggested a few times throughout this thread, her functions seem to switch from episode to episode. More often than not, her processes seem to mostly reflect a tendency towards inferior Ni as opposed to inferior Si.