Miss Lupin
Maybe because her mind is so private and none of the vampire powers (the ones that have to do with the mind at least) work on her, maybe that will be magnified. She can block those sorts of powers if she concentrates enough? there is something about what you said that that made me think of something.
get this... she can block mental things and she's only human, right? Her mind is secret, right? and you (well most of you) say that THIS is goning to magnafy. What if, she could protect not only her mind, but others as well when she's turned?
Say the lady with the painful mind trick (i can't remember her name right now) tries to put edward threw pain again but couldn't. why? becasue Bella was protecting his mind.
*is very proud of this thought*
3nodding