Beneath the Sugar Sky

Beneath the Sugar Sky, the third book in McGuire's Wayward Children series, returns to Eleanor West's Home for Wayward Children in a standalone contemporary fantasy for fans of all ages. At this magical boarding school, children who have experienced fantasy adventures are reintroduced to the "real" world. When Rini lands with a literal splash in the pond behind Eleanor West's Home for Wayward Children, the last thing she expects to find is that her mother, Sumi, died years before Rini was even conceived. But Rini can’t let Reality get in the way of her quest – not when she has an entire world to save! (Much more common than one would suppose.) If she can't find a way to restore her mother, Rini will have more than a world to save: she will never have been born in the first place. And in a world without magic, she doesn’t have long before Reality notices her existence and washes her away. Good thing the student body is well-acquainted with quests... A tale of friendship, baking, and derring-do. Warning: May contain nuts.

Synopsis from Open Library.