She sounds like she enjoys the "chase' and being desired. There are a million motives she could have from self-esteem to getting back at an ex to plain thinking you are cute.
Questions to ask yourself - \
- Do you think a relationship with a chick like this would be fruitful?
- If she DOES just want to play games/shag, are you the type of guy who can deal with this and not get hurt?
I personally have never had anything good come out of a bar hook-up, though I am sure it happens.