Talk:My Little Pony Equestria Girls: Friendship Games/@comment-4195781-20150920150428/@comment-23858349-20150920205545

The necklace Twilight has collects the Equestrian magic around Canterlot High (as mentioned in the sneak peak released earlier) so I'm assuming that she somehow absorbs it and goes mad with the power. Principal Cinch can be heard persuading her to "unleash the magic" in a song and use it to cheat in the Friendship Games as she wants to keep the school's reputation high as winners. It's likely she's plotting to win, whilst she unknowingly pushes Twilight into transforming at the climax. She's an antagonist, but I don't think she means to cause major harm, only to keep her school on top.