All Applejack wanted to do was finish her chores, help out at the Ponyville Days Festival, and have a small article written about her farm for advertisement. Was that too much to ask? If it involves Rarity and one of her romantic crushes....then yes.
When her relationship with Applejack turns sour, Twilight attempts to bury herself in her studies. Specifically, the study of Discord and what his chaos magic means for Equestria. Nothing could have prepared her for the answers she finds.