 In 540, she was pregnant when Rouran launched a major attack on Western Wei — causing the Western Wei officials to believe that the attack was launched because she was jealous of the former Empress Yifu, who was by then a Buddhist nun.Emperor Wen, under pressure, ordered Empress Yifu to commit suicide.Later in the year, when Empress Yujiulü herself was about to give birth, she heard unusual barking noises in the palace, and she suspected them as from the spirit of Empress Yifu.