Why does the Queen Mother still dislike swallows in the third part, but she has no opinion on Wei Zi?

Wei Zi is a married daughter. She also married the Fu family and gave birth to a son, which stabilized the Fu family's loyalty to the emperor. There are not so many demands. Swallow is the daughter-in-law she found back, or the wife of Mei, and is most valued by the Empress Dowager. She may be the emperor in the future. The swallow has a deep affection for Yongqi and may be the queen in the future. Swallow has nothing but Yongqi's love for him.