Meanie Genie (Little Genie Series #6) by Miranda Jones
Little Genie has made Ali the same size as she is! It’s so much fun . . . until Genie’s hourglass breaks. The only way to fix it? Visit Genieland! Genie was asked to leave her school there because of all her mixed-up magic. And now she’s broken a major rule by not protecting her special genie watch. Will Ali and Genie be able to get the hourglass repaired–or will Ali stay the size of a pencil forever?
From the Trade Paperback edition.