The restaurant, as you can see, is busy. frequens was a word that I met relatively late in my Latin learning. Before that I guess I would have said caupona est occupata, which I don't believe would be wrong, but somewhat ambiguous. For occupatus means 'busy' when referring to a person, but 'occupied' when referring to a place. This could be by a crowd of diners, sine dubio, but it could also be by a single soul - think of the 'occupied' sign of a public bathroom stall.
frequens, on the other hand, means, among other things, 'a place in which many people are present, crowded, thronged, busy'. This was the sense that I wanted to give of the caupona. I'm not sure of the wisdom of having two Lego celebrities dining in Legonium, but the students I read with seem to get a kick out of it - well, a few do. So, I'll leave them in there for now.
She immediately descends the stairs to the street. The restaurant, as you can see, is busy, but Miranda is not going to-there. Perhaps you are asking to-where she is walking?