As a bartender, having an outgoing personality and chatting people up is part of the job. in return, people will act friendly like that because they're used to bartenders reciprocating and initiating that behavior. Furthermore, those bartenders (who want tips) often attempt to remember those personal details for their regular customers.
Wen it comes to staff and the bartender, a similar behavior is acceptable.
IMHO, she's just being friendly/polite. If you're curious, ask her out to coffee.
Where's the harm in that? See how she responds and watch her eyes. If she reaches for the puke bucket, it might be a sign.