My little phony, Friendship is madness

Sort of sequel to cupcakes, Pinkie Pie gets put in jail, where she realizes that Dashie was her best friend, and that she is ashamed. Twilight and company come up with a spell that can make a pony look like another, which they use on Fluttershy to look like Rainbow Dash so Pinkie can recover and go back to her old self. Or WILL she? Maybe. Somewhat shipy, read it how you like.