A Dream of Red Mansions can be seen from this article: Why does Shi Xiangyun laugh? Why does Lin Daiyu laugh? Why do maids laugh? I still know why.

Innocent Shi Xiangyun thinks Granny Liu is stupid, cute and pitiful according to the different living conditions of the characters, so she is laughing at Granny Liu's life and performance. Lin Daiyu, who is free to rely on others, is suspicious by nature. She smiled at Granny Liu as a joke, showing her slightly acerbic character. Maids have experienced many beautiful, luxurious and ugly "masters". In granny Liu, a rural woman, what they saw was granny Liu's little helplessness, but she was forced to smile by the "grandfathers". They are not very clever if they don't laugh, so they laugh. Who can know, laugh, laugh, what grandma Liu is laughing at? I don't think it's because it's really funny Grandma Liu came to find a way to make money. She was fooled for a while and lost a little face, but after getting the money, she didn't worry about her life. The so-called "mother locust" is just the answer found by Daiyu and their ignorant children. Granny Liu, are you really so stupid at your age? Have you really never seen the world? Not exactly. Including The Banquet, Flowers into a Big Pumpkin, etc. It's all to please grandma, to make these top leaders laugh happily, to ask for more money and to be happy. People smiled sadly and piteously.