From Twilight's ascension to the loss of Golden Oaks Library, Twilight struggles to come to terms with a rapidly changing world. In this case, Twilight is in need of a friend, and Applejack will be there for her.
The gold necklace Applejack's father gave her mother when he proposed wasn't expensive or flashy, but she loved it anyway. Now Applejack just has to convince herself it really is fit for a princess.