Borderline

Castilla Duclair also known as Castilla Cullen is the eldest out of the clan. She had found Carlisle being attacked in the sewers of London and saved him but not before he met his fate of being turned. She mentored him and guided him through each step of his new life. Castilla was not your average vampire, she was created of even a boarderline of natural and unnatural. In her human life she was a witch for French royals until she was attacked in the night making her a vampire-witch hybrid.
Castilla lived a life that walked the line of good and evil. She has been away from her clan for nearly 25 years when she's a get a call from Carlisle asking for help with a redheaded vampire after Edward's human mate. This is where she meets the one and only Jacob Black and is immediately mesmerized by him and the lines between good and evil and natural and unnatural blur together even more.