During World War II and the occupation of Yugoslavia, Gross and her parents hid out near Zagreb in the village of Drenje Brdovečko until 1943, when they were arrested by the Nazis.

She and her mother were deported to the Ravensbrück concentration camp where they worked as forced laborers for Siemens & Halske AG producing bombs.

[8] She authored books on Party of Rights, Ante Starčević and Eugen Kvaternik, among other subjects.

In 1997, the Institute for Croatian History at the Faculty of Humanities and Social Sciences, University of Zagreb dedicated and published a representative collection of scientific articles in Gross's honor.

[10][11] In 2001, Gross received the Josip Juraj Strossmayer award for the most successful and achieved scientific work "Authentic Party of Rights", published in Croatia and Croatian diaspora.