The Witch’s Guide to Magical Combat Spellchasers Trilogy, book 3

Molly's shape-shifting curse is getting stronger and more unpredictable. Becoming a hare she could cope with. At least she could run... fast. But now she's turning into the prey of any predator she hears. Life's pretty dangerous if you become a worm whenever you hear a bird tweet. As Molly and her friends search for a stone that can curb the Promise Keeper's powers, and each one of them must face their own monster, Molly is forced to choose: is she prepared to use dark magic to break her curse? Will she become a witch and enter into magical combat? And if she does, will she lose the friendships she most cares about?