Nellie and the Coven of Barbo by Siobhan Curious

Cornelia (Nellie) Pike has always believed that she’s an extraordinary person meant to accomplish important things. As she begins seventh grade, she’s haunted by the feeling that something’s not right with the world, especially with her friend Lake – and that maybe it’s her destiny to make things right. But one strange event follows another, and Nellie begins to wonder if her friends, and not she, are the extraordinary ones. What’s a girl to do if she suspects that she’s nothing special, and that this might be her greatest gift?