She finds the bar at a quite opportune time. She's not being actively observed, for now, Admiral Marcus having let security slip further and further as she played the good little Augment, and as the people he surrounds himself turned out to be as corrupt as him. Little loyalty in this particular serpent's nest, it seems.
She hadn't heard of anything like Milliways during the Eugenics Wars (as the Federation calls them now), but the files she's been given or has managed to obtain anyways have recorded strange things that she would've chalked up to fiction if she hadn't seen the equations supporting them. An interdimensional bar, outside of time, connecting worlds beyond imagining, doesn't quite defy belief anymore.
Finding resources for her mission - probably not against all of Starfleet, but she'll still be revealing Marcus for the scum he is - has been rather more slow going, but Mikoto has time and patience on her side.
She's relaxing, now, an entertainingly alien drink in hand, keeping half an eye on the entrances in case anyone potentially interesting comes through.