And that's the last chapter of Earth to Twilight, as opposed to the last real chapter, which was last chapter. This is just an epilogue. The further adventures of Twilight Sparkle the Earth Pony will probably be explored in another story set in the Crystal Empire, but she's not going to be the sole viewpoint character and protagonist in that one because it'll also be about Trixie and Cadance.
Assuming I don't completely change my mind and do something else instead. I got a request to write a fic about Lightning Dust.