One minute, she was happily playing Spybot at her desk, waiting for Karl to get back. The next minute, an unfamiliar tall brunette was swanning into their office with a brown paper bag and placing it on her partner's desk.
She did not like unfamiliar people coming into her office. She did not like unfamiliar people messing with her partner's desk. And the fact that it was a woman brought this dislike up to a whole new level of irritation. Her gun was in her top right drawer.
...and shooting her partner's sister was probably a bad idea. So, of course, she smiled instead. "Alexandra, wasn't it? It's nice to finally meet you."