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I was going to suggest something along the lines of what SinfUl said. Make her come to you. Say you were thinking about going to a different bar. Tell her you already had plans to meet up with friends at a different bar, and if she meets you there, great. Don't drop everything at her call.
This is good advice. Change the venue and make her work for you like Sinful said. If she shows the interest, then just be cool (but don't play the ultra super retardedly cool guy because girls find that boring) and have a good time while building sexual tension with flirting and sexual innuendo thrown into the conversation. Build up some kino and then pull the trigger, don't wait around for permission, if you see the opening just take her back to your place and have sex; that's probably exactly why she showed up again.