West of Wicked by Nikki St. Crowe

Dorothy Gale, with little memory of her past, is swept away by a cyclone to a dark and dangerous land far from Kansas. To find her way home, she must journey across a cursed world filled with beasts, witches, and hidden dangers. As she searches for a powerful wizard who may help her, Dorothy begins to realize that the greatest threat might not be the monsters around her—but the truth about the wizard himself.