Starlight Glimmer has just seen the error of her ways and has moved into Twilight's castle. She is grateful that Twilight gave her a chance but would be surprised when her first friendship lesson came along, and what it would entail.
After Princess Twilight declined becoming the sole ruler of Equestria, her life returned to normal for the most part. It is while she is thinking about who gave her the advice to decline the role that her feelings come to the surface.