Where did Wu Zetian enter the palace for the first time?

Girl Wu Zetian and widowed mother Yang were forced to stay in Jingzhou.

In November of the 11th year of Zhenguan (637), Emperor Taizong heard that the young Wu Shi was beautiful, charming, plump, charming and strong-willed, so he put her in the palace, named her a five-talented scholar and gave her the title of "Wu Mei", and later generations mistakenly called her Wu Meiniang. When Wu Shi said goodbye to the widowed poplar before entering the palace,