For everyone who don't know, or didn't notice: there is a very important scene at the end of the chapter: "Snow in June".
June is summer in China, so snow in June is a very annomal weather condition.
This is, in fact, a metaphor, folktole, legend in China. It's associated with heavy injustice, the innocent being falsly blamed and suffer a bad, unjust end. Because human doesn't know the truth, but the heaven does, the heaven cry for them. And it's shown in "Snow in June".
So in short, MC is innocent. The heaven/god knows it, sympathize with her, and gives her a second chance.