She received her second Polish Film Festival Award for Best Actress for Prymas – trzy lata z tysiąca (2000).

Since then, Ostaszewska has appeared in more than 30 motion pictures and received six Polish Academy Award for Best Actress nominations, winning twice: for Jack Strong (2014) and Body (2015).

Ostaszewska starred in films Katyn (2007), In the Name Of (2013), Never Gonna Snow Again (2020), The In-Laws (2021) and its sequel, Broad Peak (2022), Green Border (2023) and Colors of Evil: Red (2024).

[6] She has since acted mostly at the Teatr Rozmaitości in Warsaw, working with well-known Polish directors such as Krystian Lupa, Krzysztof Warlikowski and Grzegorz Jarzyna.

In 1993, during her acting training, she played a small role in Steven Spielberg's drama film Schindler's List.

[12] In 2020, Ostaszewska starred in the comedy-drama film Never Gonna Snow Again receiving another Polish Academy Award nomination for Best Actress.

[13] It was selected as the Polish entry for the Best International Feature Film at the 93rd Academy Awards, but failed to receive a nomination.