When the Crown Prince ascended the throne, the first prince became the crown prince (Wakana (New Herbs), Part Two) and she became a chugu in the volume 'Minori' (The Rites).
その後東宮の即位で第一皇子が新たな東宮に立ち（「若菜(源氏物語)下」）、「御法」で中宮となる。