Dolmarehn (The Otherworld #2) by Jenna Elizabeth Johnson

A year ago Meghan Elam found out that she was Faelorehn, an immortal of the Otherworld. The intriguing and handsome Cade and his spirit guide help her learn about this new world that she is part of. She must learn to juggle her mortal life with her immortal one if shes going to stay out of the way of a vengeful goddess. She starts to learn how to control her magic with Cade's help, while he is on a quest to find out who she is. Soon they will both learn that she is more powerful then they ever thought possible and a secret that only one knows about...her mother.