She believed him and was ready to authorize him to strike against the princes, but the young emperor Murong Wei (then age 10) disbelieved him and stopped him from acting.
Later that year, the Jin general Huan Wen launched a major attack against Former Yan, defeating forces commanded by Murong Wei's older brother Murong Zang (慕容臧) the Prince of Le'an.
Murong Wei sought assistance from Former Qin's emperor Fu Jiān, but at the same time was prepared to abandon the capital Yecheng and flee back to the old capital Helong (和龍, in modern Jinzhou, Liaoning).
Still resentful of Murong Chui, Empress Dowager Kezuhun denied him and his soldiers rewards and in fact considered killing him.
Murong Chui, hearing the news, fled to Former Qin and became a general for Fu Jiān.
In 370, Fu Jiān sent his prime minister Wang Meng to attack Former Yan, and despite being severely outnumbered, Wang defeated Former Yan forces under Murong Ping's command, quickly advancing on Yecheng and capturing it.