You and Twilight were previously students from Crystal Prep. A kind and bright student but was treated an outcast and a lone wolf that everyone considers yourself as a threat to them.
Now at Canterlot High after she has more friends and you then gain your own powers, a grudge that you bore from your past begins to haunt you. Now it's up to Twilight to help you forget what you were and who you really are.

Seventh Entry of the MLP Equestria Girls: Guardians