Anabelle Swan was the normal girl, a bit older, then her recently-arrived sister Isabelle Swan. When Isabelle arrives, she gets accidentaly dragged into the world of blood, wars, wolves and vampires, shocked by what the people she knew all her life were. Volturi didn't know about her until upon their arrival and finding out Isabelle was still a human. Then, all of Alice's visions of her future changed.