After losing her friends to "Anon-a-Miss", Sunset Shimmer attempted to freeze herself to death. Then she meets a kindred spirit who takes her in for Christmas.
With everyone convinced that Sunset Shimmer is Anon-a-Miss, Sunset finally gives up. She's saved by strangers, a couple of whom have familiar faces. (Authorized remake of The Fall of Harmony/Like the Phoenix)
After Applejack overworks herself during the fall harvest, Sunset gets her slow down and stop running herself into the ground. Afterwords Applejack starts to see Sunset differently.