BREAKING DAWN question!!!!!?

ok. In breaking dawn when Bella is burning and becoming a vampire she overhears Edward and Carlisle talking. Carlisle says that he wonders what side Bella will take and that she always surprises him. That is all Bella hears so we don't know what they were talking about. Could you please tell me. I have finished the book and am thinking it was about Jacob's imprinting but I'm not sure. Do you know?