Friendship hasn't always been an easy thing for Sunset Shimmer. Even with what she's done in the past, she's still found those who care and cherish her. There are still times where she doesn't feel worthy of such friends, though... and it's at those times Sunset visits a particular grave at the cemetery.
When it comes to the world of MLP: EQ, there are some questions that we don't have the full answer too, such as why the magic is effecting things in the world like it is, or just what Sunset is when it comes to being with the Elements of Harmony. This story is one such question that I've yet seen answered.