Ennara and the Book of Shadows

Thirteen year-old Ennara Gaern expected studies at the Druidic Academy to be a breeze, and maybe studying magic with the world's druid leaders just a little exciting. But when she and her friends are expelled from the school for beheading a prize dragon turtle and creating zombie flowers, her world is turned upside down.
When a theft of magical artifacts is connected to her suspicious accidents at school, she and her friends must find the objects before the Druidic Council finds them, and starts a war. And on top of everything else, Ennara must learn a new form of magic to stop her necromancy from destroying her world.
Ennara and the Book of Shadows is the second book in the middle-grade fantasy series Ennara. It won a silver medal at the 2016 Moonbeam Children's Book Awards for best pre-teen ebook.