I hope for your emotional state that you are right, but it seems strange to me that she entered the pub, saw you, and walked on by without even acknowledging you - up until the point that you spoke to her.
Playing devil's advocate here, how do you know she didn't go to that particular pub in the hopes of bumping into someone else that frequently goes there? The other person wasn't there, so she
settled for you? From what you've shared with us, she doesn't exactly seem to be going out of her way to make her position with you clear. She must know you're interested, so why is she seemingly playing games?
At this point, I'd just take the advice
@RetrogradeOrbit gave; ask her straight up. If she gets offended, what have you lost? If it's meant to be, it's meant to be. If it isn't, it's experience, and you can move on.