Every day we were at MK, Merida only met from the morning until sometime around about 3 pm (I don't remember exactly when she left, but it was fairly early). There was always a line of about 15 or so people outside her meeting area; they'd fill the meeting area and then let the line form outside. When we finally met her, we waited maybe 10 minutes in the outside area, and another 15 inside. There didn't seem to ever be a really good time to see her since the line was pretty steady, but we also didn't get over as soon as she started meeting guests.