Here, I've found the letter I just mentioned, addressed to Stephanie:
"Dear Stephanie, you are now rid of my presence and annoyance; be happy in your own way. Take care of the poor wee one, she is all that remains of me. To all acquaintances, especially Bombelles, Spindler, Latour, Wowo (nickname for the barones Von Welden, Ruldolf's nanny), Gisela, Leopold, etc., etc., say my last greetings. I go quietly to my death, which alone can save my good name. I embrace you affectionately. Your loving Rudolph."
How touching that he should remember her in his final moments...