Is there really a princess who returned the pearl to the princess in history?

Princess Huanzhu is the princess's tomb that Qiong Yao saw when she visited Beijing. It is said that the Princess Tomb was adopted by a folk woman during the Qianlong period, and this woman died in front of Qianlong. Gan Long is very sad. However, the adopted daughter had no royal blood and could not enter the ancestral grave, so Gan Long built a grave for her and began to write plays.

According to the ancient title system, a princess equals a prince and a princess equals a king. In short, the emperor's daughter can be called Gege, and the prince's daughter can be called Princess. As for Princess Pearl and Princess Zhu Huan, it is impossible. When the Qing Dynasty entered the Central Plains to establish the Qing Dynasty, there was such an unwritten ancestral rule that the Qing emperor could not marry a Han woman. Therefore, the Pearl Gege involved in the novel cannot be born according to common sense. Even if it is born, Qianlong can't call it Gege. If Princess Margarita doesn't exist, then Princess Zhu Huan certainly doesn't exist.