In scripted prefatory remarks for Mary Gets Hers, playwright Emma Horwitz teases, "The girls are buzzing at the abbey at Bad Gandersheim because tonight, they're putting on a play!" This lively sentiment simultaneously nods to the play's classic source material while capturing the spirit of The Playwrights Realm's long-awaited comeback production at MCC, where an energetic ensemble enacts a farcical adaptation of the…