She is well aware of her sexual appeal, thanks for making sure it was brought to her attention. She barely reacts to the flirtation, because it's irrelevant and that's just how she is.

"I am the Astrometrics officer of the USS Voyager, which is a Federation starship. This is not Voyager. So your assumption that I am 'not from around here' is accurate, but not entirely informed."

There was no way she could determine that she would suddenly be on an unfamiliar Starfleet vessel without her knowledge. Federation space was thousands of light years from Voyager's current position.