Renesmee's twin sister

We all know of Renesmee Cullen, but what about Isabelle Cullen? Renesmees twin. Renesmee falling for Jacob, why Isabelle falls for the one and only Seth Clearwater. The littlest Cullen, Isabelle. She was the sister know one knew of because she would take the attention away from ness because of her incredible powers. The little girl growing slower then ness had the power to take the gift you have and use it, to change her looks, and to show you what she wants to. Why she is daddy's little girl, witch might come in handy