Which chapter in the first Crazy Concubine Trash Third Miss knows that Night Song is not a Trash?

I didn't read the book 'The First Crazy Concubine, the Third Miss. However, in general, the background and personality of the characters in the novel were usually determined when the characters introduced themselves or were introduced, rather than at the beginning or end of the story. Therefore, if one wanted to know if Night Gentle Song was a good-for-nothing, one would have to first understand her story background and personality traits.