According to popular opinion, the relationship between the musician and the duchess was a misalliance, so the young couple made an unsuccessful attempt to escape to America.

After the "disgrace" committed by his daughter, her father, Peter Biron left for Prague, and at the end of his life (died in January 1800) disinherited her.

[1] After Arnoldi's death, their son Frederick (Fritz) von Piattoli was born (19 September 1800, Prague – 6 April 1849, Gödöllő Palace, Hungary[2]), who was raised apart from his mother due to his father's origins.

[3] After being disinherited, the princess found shelter with the Neapolitan Queen Maria Carolina, who on 18 March 1801 in Dresden married her to an Italian from Naples, Francis Pignatelli Belmonte d'Acerenza (13 February 1766 – 20 December 1827).

[4] In 1806, Joanna received the Courland Palace in Dresden, and after her mother's death (1821), she inherited the Löbichau estate in the Duchy of Saxe-Altenburg.