Monumental faux pas!

Mason monumental... Craft not for drones! In vein sentimental, Inscribes on headstones. Because of forced brevity, A mason displayed Outrageous levity, With many dismayed! On death of Miss Biddle A small headstone bought. With words he did fiddle, To convey meaning sought! Chastity her pride... For headstone decreed: Virgin born, lived and died... Of that proud indeed! Stone not big enough For what she had yearned! His cryptic stuff: Unopened, returned!