In April 1847, Yasuko became an empress dowager because she was the biological mother of the new emperor, but on November 20, 1847 she entered priesthood and received senge for Nyoingo, and then died on that day.
翌弘化4年（1847年）3月、祺子は新帝の嫡母として皇太后となるが、同年10月13日、出家して女院号宣下を受け、同日中に崩御。