A second chance {Elijah Mikaelson} { Salvator Sister}

Uhmmmm this is my first story so far the jist of it is Damon and Stefen believed that their sister Claire was dead and vise versa. Her father is now dead and she's all alone in mystic falls, so she leaves in search of a purpose now that she has no family when she becomes best friends with Kol Mikaelson and his family becomes hers. Suddenly, things take a drastic turn when Mikael shows up and kills her. Fast forward to present day mystic falls (after the sacrifice when Mama Original is awoken) Claire suddenly wakes up from her grave and is alive again? Why and How