Empress of the Great Qing

Nala Si Xian had hoped to spend her life with Prince Cheng Yun Mi, but never expected to marry into Prince Bao Hong Li's household. There, she and her older sister Gao Lan both became Hong Li's secondary consorts. The palace was rife with hidden dangers. Gao Lan, Empress Fucha Fu Ying, and numerous princes and princesses all died, making Si Xian, who later became empress, increasingly suspect that Consort Ling, Wei Shi, was responsible. Only in the end did she discover that the true mastermind was actually...

This is a historical novel, not actual history. The transmigrators are Consort Shu and the Empress Dowager; neither is the protagonist.