She appeared in two films: In Desert and Wilderness, which was produced as a movie (1973) and miniseries (1974), and a dubbed version of The Water Babies (1978), a British cartoon.
Rosca, who is half Romanian, was nine years old when she was cast in the role of Nel Rawlison in the film version of the adventure novel of Polish nineteen and early twenty century leading epic writer and 1905 literature Nobel Prize winner Henryk Sienkiewicz In Desert and Wilderness (1973), beating over 4,000 other girls to win the role.
After finishing high school she attended the Warsaw and Łódź Academies of Music, twice being awarded the Fryderyk Chopin Society Scholarship.
She has appeared in concert in Poland, Germany, United Kingdom, France, Romania, Russia, Korea, Indonesia and India.
They appeared together on Wojciech Jagielski's television talk show in 2000 when discussions were underway regarding a possible remake of the film.