For the Imperial Family, the departure of Consort Duan was naturally a scandal, and also a disgrace that tarnished the Emperor's prestige. Hence, it's not hard to understand why the Emperor made a fake Consort Duan and banished her to the Cold Palace.
And Xiao Zhen, all these years wanting to visit his mother in the Cold Palace, was indeed stepping on the Emperor's dignity, which the Emperor naturally forbade. Not only did he forbid it, but seeing Xiao Zhen reminded him of Consort Duan's departure, an unresolved blow to his imperial authority.
Furthermore, King of Ling Mountain's audacity to demand people from the Emperor back then was unexpected, and the most remarkable thing was, he actually forced the Emperor to return the person.
Ling Hua recalled the late Princess of Ling Mountain. She had met the old princess, who was quite kind, similar to the Empress Dowager, but her health wasn't as robust, and she passed away early.