"I didn't," she said honestly. "I went to college as a biology major, but I got recruited by someone who noticed my talent for Necromancy--" She held up a hand for them to bear with her as she explained, "And yes, Harry has already checked me out to make sure that I'm not the evil kind. Anyway, I was recruited by Animators, Inc. and trained as a vampire executioner, because animators have a natural resistance to vampire magic--all magic, really, but especially against vampires, because of our ability to control the dead."
So, yes, basically, she was Buffy. Or Faith. "I was a licensed vampire hunter for three or four years before they passed a federal law that gave us a badge and jurisdiction to cross state lines in chase of our preternatural perps, and I'd already been helping the local version of Special Investigations, because I knew a little bit about the supernatural world than the mundane cops. That, and there was this love triangle between a master vampire, an alpha werewolf, and myself--but I'll spare you the cliched details on that. Long story short, I didn't really choose the politics, they just sort of came with the territory. I just...can't not help people."