Agnieszka reported to the group leader, a former Polish Olympic athlete Janusz Kusociński, but she was arrested on 25 April 1940 and imprisoned in the Pawiak prison near Warsaw along with other activists of the Wolves center. She was tortured in the prison and then trucked to the Palmiry forest where the prisoners, including Kusociński, were murdered. Her body was thrown into a ditch several meters deep and lost for many years, but in 2017, her remains were unearthed and identified.