Emma and the Minotaur by Jon Herrera

Enter a world of magic, secrets, and creatures of legend returning from exile.
Join Emma Wilkins as she begins her adventure across two worlds in the second edition of Emma and the Minotaur, released in anticipation of the upcoming sequel Emma and the Prince of Shadows.

A great power has awakened in the forests of Saint Martin.
Called by the song of an ancient oak, diminutive Emma Wilkins finds herself face-to-face with the colossal Minotaur. Following a narrow escape, Emma discovers that she is the only one who can stop the monster—all while keeping up with her homework and not getting into trouble at school.
On her way to an impossible confrontation, Emma will learn that the crisis is greater than it seems. At stake are the fates of those she cares about the most, and that of the entire world.