"I know just how stubborn you Winchesters are remember?"
It was a undeniable truth if ever she'd heard one, the Winchesters really were stubborn. It had taken her a lie and a whole lot of time to break into Sam's life, and even longer before he'd trusted her enough to let her stay there.
But now she was there she wasn't going anywhere. No matter what.
"You know I'll do that too don't you? Whatever it takes. Alastair's not going to win this one. And you're better than him Sam. You are. So I have no doubt that we'll find a way to finish it"