One is birth. We often say where the hero Mo Wen came from, but did feudal society attach importance to it? Birth theory? This is not all because they are backward in thinking, but behind their origins, often the intervention and game of political forces. Your princess is a Han girl and her father is a slave. Such a background (especially not Manchu) doomed her to be unable to seal the queen. Look at the two queens of Qianlong, one is Fu Cha, a confidante, the father is the manager of Chahar, and the younger brother is a Taibao university student; One is the abolished Uranara, and his father is Zorin Naboo. The two queens are both of noble birth, and more importantly, they are Manchu. Your princess is an ordinary Han Chinese. Even if Qianlong had a heart for her, the DPRK ministers, especially the Manchurian ministers, would not agree. Later, Qianlong simply vacated the queen's establishment and asked your princess to represent the queen's imperial concubine.
Secondly, Emperor Qianlong has actually chosen his 15th son, Gala, as his successor. In the thirty-eighth year of Qianlong, he secretly named Yong Zhengdi's fifteenth son as Chu Jun. Obviously, in order not to let outsiders guess his intention to set up a shop, and in order not to cause the struggle between grandparents and parents, Qianlong must deliberately hide all this, while the gala at this time.
Third, the funeral orders of the first two queens were seriously considered. Fu Cha is Ganlong's favorite. Maybe she is the only queen in Qianlong's heart, and her position will never be replaced. Whoever sits in that position will not be what Qianlong wants most in his heart. The main reason why Nora became queen was the pressure of the queen mother, which ended in tragedy. Your princess didn't become a queen when she was alive, but Emperor Qianlong gave her everything she could except the junior position, so it doesn't matter whether she is a queen or not.