In the last years of Kangxi, Nian Gengyao's sister married into Yongzheng as a concubine, and started life in the palace with her original wives and concubines. After Yongzheng successfully became emperor, she did not enjoy the glory of a noble concubine too much, so she died in the pain of losing children one after another with worries about her brother.
In the years since she married Yongzheng, other women rarely gave birth to children, which shows the favor she received.
Intention: Those who are content are always happy