阅读短文，回答问题。
Mary is from Canada. She teaches English in China now. She know a little Chinese. She isn't free from Monday to Friday. So she often goes shopping on Saturday. Today is Saturday. Mary goes to the shop. She comes out of her car and goes into the shop. "What can I do for you?" the girl in the shop asks her in Chinese. Mary thinks she can tell the boy what she wants in Chinese. So she says in Chinese, "A quilt (被子), please." Then the girl goes to the back of the shop. "My Chinese is not bad. The girl understands (理解) me." She thinks.