[While Rose has heard of Buffy via Spike and Sam, she has never met the girl. She knows that she is a slayer and while she wouldn't give her a reason to stake her, Rose would still be careful around her. She didn't require food to sustain her but it didn't stop Rose from checking out the place because she was curious; she'll probably just order a few drinks and that would be it.
Of course, when Rose was thinking about this she wasn't looking where she was going as she almost collided with Buffy.]
Sorry! [She says apologetically, taking a step back from her.]