OK, so my theory doesn’t survive the most minimal scrutiny. In the first movie, the portal specifically only opens every 30 months, not 4 years Sunset’s crowns are more likely for Grade 9 Spring Prom, Grade 10 Fall Homecoming, and Grade 10 Spring Prom, not 3 Homecoming dances. This lines up with the 30 months/2.5 years timeline, and matches the fandom’s consensus, which states the first film takes place in the fall of Grade 11. … but while it doesn’t fit our Sunset Shimmer, it might explain what happened to the human counterpart of Sunset Shimmer…