Kaylee was focused on herself in the mirror as the girl spoke to her, so she didn't hear much of what she said.  She caught the "later barbie" part, though, so she turned her head to watch her as she slipped out of the door and called out softly, "Bye."  Kay looked back at the mirror and finished the last touches of her make up 'fore she put everything back in it's place.  She stepped back from the mirror to get a full picture of herself and checked herself out one last time to make sure everything looked okay.