what if Elsa was evil?

my story is that Elsa left after what happened at the ballroom decided to never go back.. knowing people would just try to kill her for her unique powers..so she turned bitter or.colder?. and leaf to the Himalayan mountains to build her new EVIL empire of frost and coldness but it wasn't enough so she gained the ability of fire control...and went to get her revenge on everyone who wanted her killed( Elsa belongs to Disney and the artsyle belongs to nelljolester)