Proper Pureblood Education
5 parts Complete Narcissa is lucky in many ways - luckier than her former husband (who didn't survive the war), certainly, and fortunate enough to have somehow, miraculously, seen Draco cleared of all his charges.
When it comes time for her own trial, she's ready to accept time in Azkaban, as long as she can still be released some day to see her son grow into an adult.
She might even have been sent there, if it wasn't for the way that the new head of her House, one Lord Potter-Black, personally intervened, with his own ideas of how she can repay her debt to society.