How are day and night still happening without magic? What did Twilight Sparkle do with the Day Night Amulet?

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Art used in thumbnail: https://www.deviantart.com/decprincess/art/SPOILERS-Grown-Twilight-9x26-SPOILERS-812236906

Other media used:

https://www.deviantart.com/emeraldblast63/art/Future-Twilight-Sparkle-815512516

https://www.deviantart.com/themefinland/art/Forgotten-grave-816672964

Background music by Kevin MacLeod
Link: https://incompetech.filmmusic.io
License: http://creativecommons.org/licenses/by/4.0/
Tracks used as follows:

Bleeping Demo
Lightless Dawn
Gothamlicious
Acid Trumpet
Aquarium
Mechanolith
Heroic Age

"Flurry's Part" (outro music) by me: https://www.youtube.com/watch?v=trP1t8dSMg8