what you say has lots of merit for bella's character.......I beleive in past lives and reincarnation not just on this world..... many worlds out in our universe have life far more advanced spiritually and technology beyond our wildest dreams..and also worlds where the people still live in love and harmony with nature like the navi of pandora...the inspriation for this saga came from a dream and some of our dreams come to us from our higher selves that are connected to the universe in ways we don't always grasp or can't get our human minds around.......I also beleive that out there in the universe is a planet with vampires and humans not unlike our story where there is a edward and bella or was or will be....and yes they would tend to reincarnate on there own planet bella having been a vampire befor absolutly......I see you....be safe.....
I don't necessarily think she was a vampire in a past life; I just think all the things you mentioned were like signs that she was meant to become a vampire, like that she was destined, born into it. I think at some point in one of the books someone even talks about--though perhaps vaguely--her being sort of predestined to become a vampire because of her traits. Or if not destined, seems like some people are at least better at adapting towards becoming one.
This idea is something i've never considered before, but now that i've read through it, it all completely makes sense. As J.E.B. said, i also believe in another world not unlike the world of Bella and the Cullens. It's a difficult concept to grasp, but i utterly believe it. So i therefore think the idea that Bella was a vampire in a previous life is probable. I also had a similar idea about Jacob. I know that he is supposedly descended from wolves, but i did consider the fact that prehaps Jacob (and the other wolves) were actually wolves in a previous life. And then from being a wolf and going to a human, the two beings are merged. So this life is like half way, and in his next life he'll be fully human... you know? So this is his second life, and he's in the progress of moving from a wolf (from his previous life) to a human (his next life). I don't know if that makes sense.. let me know what you think :)