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In A Dream of Red Mansions, what role does granny Liu, an old woman from the countryside, play when she enters Guo Rongfu? Try to analyze

There are three references in the book:

For the first time, she took Banel to seek some relief, but she didn't see anyone. Xifeng gave twenty taels of silver and went back.

The second time, I brought some gifts to commemorate Fu Rong. Grandmother Jia invited her to the Grand View Garden and made many jokes.

The third time, Xifeng's daughter Qiaojie was almost bought, and Xifeng begged Granny Liu to secretly take Qiaojie away. (This is a good karma for Wang Xifeng's previous relief for Granny Liu ...)