Isabella Swan is actually Isabella Marie Grace Salvatore the daughter of Damon Salvatore and Isabelle Grace a werewolf . Bella is like Klaus half werewolf half vampire and her wolf side is locked to, from witches on the otherside . Her curse is different instead of a human doppelganger, vampire, and a werewolf she has to have a vampire doppelganger, werewolf and a witch.She is unknown to everyone except her daddy and her Uncle Stefan, some of the Mikaelson's, and of course Isabelle but she died giving birth. When Edward leaves here she decides it is time to go back home to Mystic Falls. There she sees Klaus again and they find love together.