Though in the flashback where she describes herself as 'smiling and laughing' she just looks pissed-off.
Also: "I should have noticed before anyone else." Could just be generic guilt, but could point to some kind of trouble with other Belkans or the Knights themselves.
Minor thing, but it's interesting to me that the Knights consider themselves ancient. Since their memories of their previous incarnations don't seem very intact and their emotional lives more or less began with A's I'd have thought otherwise.