Madam Qin had given Yunjin some scented pastries and fragrant oils, which Yunjin had researched these few days out of boredom and roughly figured out what ingredients they were made of.
Having gotten used to bathing with the scented pastries sent by Madam Qin, and since there were none for sale in the market, although Madam Qin had given her these items several times, it wasn't good to always expect gifts from her.
The only solution was to learn to make them herself. Once she had mastered the process, she could make them whenever she liked. Conveniently, her second elder sister also liked them, and once Yunjin learned, she could teach her too.