It is not possible to quantify your risk, and she may be negative. Only a test can provide the answer. You can take a duo test at 28 days for a conclusive result.
Try to relax while you wait, and avoid Googling for symptoms, because HIV doctors do not diagnose from symptoms since they don't prove anything.
Since the bar knows her, I would ask her to test now. If she is negative that cuts down the chances she is positive to her 28 day window period and she might have used protection then in which case she would be negative. No matter what her test shows today, either she or you will have to test negative in 27 days for you to be conclusively negative.