Stepping back a bit, even if The Emperor would forever stay by Empress's side alone, those selected palace maidens could at least give her some annoyance and disgust her.
The moment she thinks of Empress's frustrated and furious demeanor upon her return, finding herself surrounded by beauties, her heart feels incredibly comfortable, as if she had vented all the anger she once received from the Empress.
However, such scheming thoughts dissipated into thin air the moment she saw Cai Wei take care of Li Kaifeng.
Now, she dared not make any mischief anymore, even regretting the Imperial Edict of Selection she had already issued, had she known that this daughter-in-law was so awesome, she would have contentedly been a good mother-in-law, why bother causing her son unhappiness, daughter-in-law dissatisfaction, and making herself look like "Pig Bajie Looking in the Mirror", detested by everyone!
Alas, later on, she must find a way to properly explain to her daughter-in-law.