Agatha was a rational female villain. That was a fact.
She would have not been able to strike a deal with the Borlean royals if not for her wits. She would also have not been able to get so many aristocrats of Holon even with the king's affection had she been a foolish woman.
However, there were also times when her emotions could get into her head, no matter how intelligent she was.
'That youth was the one behind the one week of suffering!'
She immediately figured it out the moment she read the letter. But although she was angry, she really did not have the courage to fight the other. At least not face to face.
Yet she was also not content with letting bygones be bygones, or pretending it was not in her nature to counterattack when targeted.