How did your princess die?

Empress Xiaoyi Chun (Wei Jiashi) was named Wei Guiren for ten years, and was promoted to a coffin in the same year; In the thirteenth year of Qianlong, he was promoted to princess; In the twenty-four years of Qianlong, he was promoted to the imperial concubine; Twenty-five years after Qianlong, he gave birth to the fifteenth son of Emperor Jiaqing. For thirty years, he was promoted to the imperial concubine; At the end of the thirty-ninth year of Qianlong, Wei Jiashi fell ill after returning to the palace from Jehol with the Emperor Qianlong, and died on the 29th day of the first month of the 40th year of Qianlong at the age of 49.

Extended data:

After the death of Xiao Yichun (Wei Jiashi):

On the 11th day of the first month of the 40th year of Qianlong (AD 1775), Yi Guifei was appointed. On October 26th, the 40th year of Qianlong, the imperial concubine and the golden coffin were given to Yuling in Feng 'an. In the 60th year of Qianlong (A.D. 1795), on the 3rd day of September, Emperor Qianlong declared the fifteen sons of Emperor Armadillo as the Crown Prince, and at the same time, Wei Jiashi, the mother of Crown Prince posthumous title, was the Filial Empress. After Jiaqing and Daoguang, it was added. Posthumous title's full name is: filial piety, respect, health, kindness, benevolence, sensitivity, philosophy, wings, heaven, jade, holiness and purity.