Talk:My Little Pony Equestria Girls: Dance Magic/@comment-31036366-20181025122318/@comment-10390252-20181025135249

I think it's because the social environment at Crystal Prep is merciless towards losers and Cinch was a loser. It would have been impossible for her to retain her authority with the faculty and students so she resigned before things got bad enough to endanger the future of the school.