Actually, I'm surprised I've yet to see anybody, anywhere, call this one out:
Watch Twilight and then watch New Moon. First film, James ("evil white vampire" -- sorry fans, but that character is so unmemorable I had to look up his name) is "tracking" Bella, and it's implied all over the place that this is an ability enhanced supernaturally -- it's also established that Edward can't read Bella's thoughts.
Second film, the Volturi(sp?) establishes that Bella is somehow immune to all vampire powers, and that this will be enhanced if the Cullens turn Bella. She's immune to Edward reading her thoughts, immune to Alo reading her past, immune to Jane's psychic pain.
So, yes... She's immune to "all" vampire powers, but can be easily (very easily) tracked by a vampire with a supernatural tracking ability? As best as I can tell, the books pretty much ignore how well James was able to track her after he dies. That's not good writing; it would be adequate if it was something that could easily be worked as something other characters may lack knowledge of, it's even understandable that Alice can see Bella's future, because that so rarely has an immediate effect on the actual outcome, but the Cullens knew how well James was tracking Bella.
It's also established by the second film that Jasper can affect Bella's emotions, another contradiction to Bella's "immunity shield", though that's a little more forgivable, as SMeyers also manages to establish that Bella is aware when Jasper is doing it -- it's less a complete contradiction of Bella's "immunity shield" than how well James is able to track her down.
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