Swims-With-Salmons
"Is it illegal? Did I break any law? Jokes aside, if I planned to do something aggressive, either you wouldn't notice me until it was too late or my intentions would be telegraphed enough that you would notice me much earlier." Probably the second. She wasn't born under the phase of moon that made her kind exceptional at stalking.
She noticed that the man could manifest a weapon from thin air. A curious and certainly useful kind of magic. Their nature clear to her, she just decided to blend in and spin a story that she usually sold when meeting such type of people.
"Anyway, I'm a wizard, mage, sorceress, whichever name you use to describe people like you and me. I'm also here to keep tabs on whoever has that large signature of magical energy." The only thing she concealed was that fact that she was a werewolf. But the rest of her story was true and should have passed any magic that detected outright lies. A truth was a truth after all, as long as there was no outright lie.