That got me thinking... it will most likely be the same when Bella is a vampire, maybe even stronger. Does that mean she will be immune to the blood lust, not as necessarily her main ability, but as someone she just HAS? Edward explained in Twilight that vampires wouldn't die if they never ate... that food wasn't a physical need like for humans. And because Bella is immune to things messing with her mind... maybe she won't be affected by the desire for blood. Because really, that's all in your head. You won't die without food.
Anyway it's kind of wistful thinking. I really hope it's true, even though it might be a long shot.
It was just something Bella really began to worry about in the end of Eclipse and the idea just popped into my mind.