I was chilled when I read Lemur's post on the death of Vetsera, so I got out my copy of The Fall of Eagles, by C.L. Sulzberger, and for those interested, here is the direct quote concerning the macabre scene:
"Rudolf's body was taken to Vienna while Marie's was hidden in Mayerling until the following night. The girl's two uncles led by Viktor Baltazzi of a respected Constantinople lineage,...threatened a public scandal if they could not reclaim their niece for the family. Finally the palace acceded. They dressed her stiff corpse, walked it between them to a carriage as if she were merely ill, drove to the capital after forcing it, rigor mortis and all, into a semblance of sitting posture, and had her secretly buried in a Cistercian abbey." p.164.