Lol, I just had this idea in my head, and decided to write it. Fun fun.
Bella is a witch, from Hogwarts. She graduates and falls in love with Edward in Forks. Edward and his family are vampires. Her dad then dies from an heart attack not too long after falling in love with Edward. She is 15 at the time she falls in love with Edward, 16 when her dad dies. Social Services come and decide to take her. Her mom is already dead, because her mom is a witch and was killed fighting. Scared for her and her grey arabian mare, she takes off, running from them.
Will write it soon. And yes, I know she is a little young graudating from Hogwarts, but its the only way for the plot to work.