Soon, Bishop Bai came to visit Xingyi and found out that she was without family so he took her to the local parish to learn more about Christianity.

When Tsao became eighteen, she married a local farmer, but her brother- and sister-in-law treated her as an outsider (for she was Christian) and did not consider her a part of the family.

In 1852, she went out to the town of Baijiazhai in Xilin County and made it her preaching headquarters, teaching the Catholic faith throughout Guangxi.

In 1856, when she was helping out in Yaoshan, Guangxi (near present-day Guilin), the local government decided to take some measures against the Christians living in that area.

Finally, on the 22nd day of the first month (Chinese calendar date), the magistrate decided on her punishment.

Agnes Tsao Kou Ying is honored (with Agatha Lin Zhao and Lucy Yi Zhenmei) with a Lesser Feast on the liturgical calendar of the Episcopal Church in the United States of America[4] on February 19.