The Girl with the Whispering Shadow: The Crowns of Croswald Book II - D. E. Night

Even a secret town cannot protect Ivy from a mysterious darkness... Only hours after Ivy Lovely discovers that she is the fulfillment of the Moonsday promise, she is whisked away from her beloved school to Belzebuthe, a secret town for only those with magical blood. Ivy sets out on a mission to uncover the second facet of the Kindred Stone while eluding the Dark Queen's wrath. But even when she's supposed to be safe, something is shadowing Ivy. She will need all her natural-born magic and more as she battles to find the rest of the Kindred Stone and return to the Halls of Ivy. Before it's too late...