Immortality's A Burden (An Unofficial Twilight Novella)

Alexandria appears to be a 15 year old, unhumanly beautiful, snow-white pale, red eyed angel. But really, behind that smile, she wishes for death. She hates her father for turning her into a demon for his own selfish needs, so she runs away from the life she has lived (and hated) for nearly 23,000 years. She lives life as a 'vegetarian' and befriends the Cullens. She soon finds out that the life of a vampire is actually great.