Because she had been Saiin for a long time since the reign of Emperor Suzaku, she missed the chance to get married, remained single, became a nun, then stepped off the center stage of the tale.
朱雀帝時代から斎院を長く続けたたため婚期を逃し、そのまま独身を貫き通して出家、物語の表舞台から消える。