Her whole purpose is pretty much in her senses. that and her coinpurse. She's not a fighter, she's not a mage, and the only other skills she has other than trading are her crafts. besides, it's not like she'll sniff you and know exactly where you've been for the last week, what you ate and when you slept. She can smell the presence of magic, certain aspects of it, and can differentiate between scents. I don't see how that's any worse than someone who can look like whatever they want, or who can turn into a maniacal killing machine.