When I had assumed that someone changed a human, I had thought perhaps it had been Alice or Jasper so that she would be your niece, yet Jasper had mentioned something about Bella...
I cannot believe that I would be that foolish, turning a human while she was near death. Only Carlisle was capable of that, of the control required.
Besides, how could she have become pregnant? I... this does not make any sense at all. How do you know this, Rose?