My Little Pony: Equestria Girls (2013)
Via a magic mirror, Twilight Sparkle travels into an alternate universe in order to recover a crown that was stolen from the Crystal Empire. Upon her arrival she is horrified to learn that she has turned into a human. princess, high school, friendship, magic, villain, pony, pegasus, crown, prom, based on toy, another dimension, unicorn, prom queen, female villain, quest, amused