The Salamander Spell — E.D. Baker

Grassina, Emma's wonderful, magical aunt, is herself a teen in this prequel to the Frog Princess books. She and her sister, Chartreuse (Emma's irritating mother from the other books) are vying to see who will get the family's inherited magical skills as they navigate the intricacies of being a princess in a magical kingdom-a bevy of mostly terrible would-be suitors, a father who becomes a ghost, a mother who changes from a stressed, but semi-normal human to a selfish witch, and the arrival of some terrible werewolves. When Grassina finds and falls in love with a wizard-in-training, Haywood, and invokes the wrath of her sister, it is the werewolves, who despite their evil ways, bring about Grassina's change from mortal princess to Green Witch powers. Every bit as funny and satisfying as the other stories!