Princess Xiang in Princess Huanzhu and Swallow in Princess Huanzhu. They celebrated the emperor's birthday. Which episode?

In episode 12, the queen learned that the swallow had been stung by a bee and came to Shufangzhai to see a joke. Not content, the swallow cleverly stuffed the petals into the queen's hat. As a result, when the queen came to the imperial garden, a group of bees attacked the queen and Sister Rong again. When she saw the queen, she turned pale with fear, but the swallow and the others smiled happily. Er Kang, Wei Zi and others carefully planned a wonderful program to celebrate the emperor's birthday, and Qianlong was greatly surprised. However, just as everyone was immersed in a happy birthday, they found evidence of the murder of Gan Long in Shu Fangzhai. Swallow, Wei Zi and others are arguing that all the servants are put into prison at once.