Pam is correct (of course there's going to be questions, it's kind of what she does, constantly). That information just launches her into another round of questions and observations delivered at high speed, never really waiting for an answer to her questions before extrapolating on the information she has and answering them herself.

...

And then she stops, and blinks.

"No wonder you hate scientists." She's just realized that surely some clever someone has realized this fact about vampires, and... well. She remembers that comment about not wanting to be a science experiment.