Here's how one key scene might have gone if Bella really was the nerd she claimed;
"I'm a... say it..."
"Kryptonian?"
"Uh... wait, what?"
"Daxamite then?"
"No, that's silly..."
"A Mutant!"
"No. No, I drink blood!"
"You're The Tick!"
"Uh.. hey, Jacob, take her, she's all yours..."