Fairy Realm '1: The Charm Bracelet, Paperback/Emily Rodda

When Jessie visits her grandmother's house, Blue Moon, she discovers an amazing secret, and enters the Fairy Realm for the first time. All kinds of magical beings live in the Realm, and a noble Queen in a great golden palace rules them all. But the Realm is in danger, and Jessie must outwit an evil enemy to save it before it's destroyed forever