Angel's Child, Devil's Curse

Isabella was a normal girl until a mysterious stranger turned her world upside down. Now she has been plunged into a world that she never knew existed with expectations on her shoulders far heavier than any before. She thought she was human but now is beginning to wonder what exactly she is? Zach tells her she is only half a person. How can that be? Will she fight to save the world or will she falter under the weight of a world of magic?