What is the status of the daughter of Empress Dowager Tai?

The empress dowager is the emperor's grandmother. Her daughter is the emperor's aunt. So it's called Big princess royal.

The titles of close relatives of the royal family are as follows:

Since the Han Dynasty:

The daughter of a dynasty emperor is called a princess!

The emperor's sister is called princess royal!

The emperor's aunt [that is, the sister of the emperor's father] is called the big imperial concubine!

Since then, it has been used by the royal family in the late Qing Dynasty.

From Tang Dynasty to Ming and Qing Dynasties;

The emperor's aunt is called big princess!

The emperor's sister is called princess royal!

The daughter of a dynasty emperor is called a princess!

Except those who inherit the throne, the sons of emperors are generally divided into princes, that is, the king of one word, such as the king of Qin, the king of Hanwang, the king of Wu and the king of Xiang.

The prince's daughter is called a princess.

The son of a crown princess is generally divided into two characters, such as Guo Ziyi or Fenyang King [don't call him "county king" when expressing respect, and Zheng Chenggong was named Yanping County King by Nanming Emperor, etc.

So the daughter of the king of the county is called the princess.

The Ming Dynasty added the following titles:

The granddaughter of the county king is called the county king.

The great-granddaughter of the county king is called the county king.

The great-great granddaughter of the county king is called Xiang Army.