Attack of the Moonlight Madmare

Whispers around Ponyville have led to Nightmare Night being canceled this year. Are the rumors true?

Nightmare Night has been canceled this year because of what is supposed to be an old pony tale. Twilight and her friends let a strange mare in the castle. Will they regret it?

I know my horror writing is at least a little rusty. I wrote this while recovering from a minor surgical procedure, so please bear with me. And yes, the Moonlight Madmare is my OC, Puzzling.