Why did Empress Dowager Cixi "clap her legs and laugh" when Eight-Nation Alliance swept the palace?

Empress Dowager Cixi's surname is Ye Henala, and the Qing emperor's surname is Aisingiorro. It is said that Yehnara was the only rival and mortal enemy of Aisingiorro during the period of unification and Manchu Dynasty. In his downfall, the leader of Yehenara said that "Yehenara people will fight Essien Joro to the end even if they fight to the last woman". Therefore, it is also an invisible thing for Empress Dowager Cixi to bring down the Qing Dynasty.