Just like... if it were a close relative she cared about who arranged for spies around her, she would surely accept it calmly.
At this moment, he sent Yue Shi to deliver a letter to her. Yue Shi didn't bring back a letter but instead brought back her anger, which is what Empress Dowager Yan wanted to see.
Yue Shi is a child who can't hide his thoughts. If everything were told to Yue Shi, she feared Yue Shi, in high spirits, would go back and arouse suspicion from the spies placed by Empress Dowager Yan around Xiao Rongyan.
What Empress Dowager Yan wants most is... for her and Xiao Rongyan to fall out, at which point Murong Li would propose the strategy of merging the two countries, and Murong Yan would oppose it superficially. This is the only way Empress Dowager Yan would give the greatest trust to Xiao Rongyan on the matter of merging the two nations.
