The more I think about it, the more I think I would have been fine with the story if there had just been three sentences about how, while doing all the magic stuff with this one individual kid, she was also pursuing systemic change to their overdue policies. (If there hadn't been constant in-story mentions of overdue fines, it wouldn't have twinged me the same way--but there were, and so the issue was hard for me to forget about.) Which is perhaps idiosyncratic of me, I'll admit.