She was born Eleonora Hermina Gregor in Görz, a town which then belonged to Austria-Hungary, but is now part of Italy, to Austrian-Jewish parents.

[3] On 2 December 1937, five days after the prince's marriage to his first wife (the former Countess Marie-Elisabeth von Salm-Reifferscheidt-Raitz) was annulled, he and Gregor wed in Vienna.

She was depressed by her exile to South America, and many sources claim her early death in Viña del Mar, Chile was a suicide.

She worked briefly in Hollywood during the early sound era, appearing in the foreign-language versions of films such as The Trial of Mary Dugan (1929) and His Glorious Night (1929).

She was considered to be one of Austria's more popular film stars during this time, and she appeared as a stage actress at the famous Burgtheater.