She couldn't help but chuckle at his reaction, an unrepentant smile curling the corners of her lips. If he knew about the Hellmouth then he was in the know. She didn't have to hide. Too much.
"I'm a wizard. My boss told me. We're here to help." She won't say who her boss was. No throwing Harry under the bus, thanks. Besides, he was her ace in the hole if things went south, and what a surprise he could be!
"I just got here a couple of days ago. Nice town, if you like feeling exposed."