Stéphanie married again on 22 March 1900 at Miramare.
The groom was Prince Lónyay de Nagy-Lónya et Vásárosnamény (Bodrogolaszi, 24 August 1863 - Budapest, 20 July 1946), a Hungarian nobleman of unequal rank who, in 1917, was elevated by the Emperor of Austria to the rank of Fürst.
Her father was so furious at the marriage that he forbade Stéphanie to see her dying mother.

She settled with her new husband in his castle Oroszvár - Rusovce in western Hungary, modern-day Slovakia, until the advancing Red Army forced them to flee their estate.
They found sanctuary in Pannonhalma Archabbey, near Györszentmárton, Hungary.

In 1935 she wanted to publish her memoir to set the record straight, but this caused a scandal and a court forbade their distribution.
Police visited every bookshop in Vienna in order to seize the copies already on sale.
In it she published Rudolf's last letter to her, and proclaimed that (in her view) he and the Baronness had made a suicide pact.
Her memoir was eventually published outside of Austria in 1937 as Ich sollte Kaiserin werden (I Was To Be Empress).

Stéphanie died at Pannonhalma on 23 August 1945.
Her only child, Archduchess Elisabeth Marie of Austria, had four children:
Prince Franz Joseph of Windisch-Graetz
Prince Ernst of Windisch-Graetz
Prince Rudolph of Windisch-Graetz
Princess Stephanie of Windisch-Graetz
Stéphanie married again on 22 March 1900 at Miramare. The groom was Prince Lónyay de Nagy-Lónya et Vásárosnamény (Bodrogolaszi, 24 August 1863 - Budapest, 20 July 1946), a Hungarian nobleman of unequal rank who, in 1917, was elevated by the Emperor of Austria to the rank of Fürst. Her father was so furious at the marriage that he forbade Stéphanie to see her dying mother. 
She settled with her new husband in his castle Oroszvár - Rusovce in western Hungary, modern-day Slovakia, until the advancing Red Army forced them to flee their estate. They found sanctuary in Pannonhalma Archabbey, near Györszentmárton, Hungary.
In 1935 she wanted to publish her memoir to set the record straight, but this caused a scandal and a court forbade their distribution. Police visited every bookshop in Vienna in order to seize the copies already on sale. In it she published Rudolf's last letter to her, and proclaimed that (in her view) he and the Baronness had made a suicide pact. Her memoir was eventually published outside of Austria in 1937 as Ich sollte Kaiserin werden (I Was To Be Empress).
Stéphanie died at Pannonhalma on 23 August 1945. Her only child, Archduchess Elisabeth Marie of Austria, had four children:
Prince Franz Joseph of Windisch-Graetz
Prince Ernst of Windisch-Graetz
Prince Rudolph of Windisch-Graetz
Princess Stephanie of Windisch-Graetz
Princess Stéphanie of Belgium