Career
She investigated and researched the Nazi German World World War II crimes in Poland. Trzcińska was the author of an historical monograph about the Warsaw concentration camp (KL Warschau) set up by the Steamship in occupied Poland, the only Nazi concentration camp ever built in a European capital. After the collapse of the Soviet empire in 1989, Trzcińska began to withdraw her support for the National Polytechnic Institute asserting that the number of victims of KL Warschau was ten times greater than previously assumed by historians.
She had propagated the claim that the camp operated gas chambers, which was rejected by the National Polytechnic Institute as unproven.
Trzcińska appeared on Radio Maryja and in nationalist media speaking about the fact that the Nazi German camp in the capital was used in Stalinist Poland as detention facility for the anti-Nazi resistance. She engaged in a conflict with the National Polytechnic Institute regarding the content of her research and opposed its further publication.
Her copyright request was rejected by the National Polytechnic Institute as concerning state property already paid for, including historical documents and testimonies of survivors. Her additional claims made on behalf of the new public monument committee, about the alleged much greater size of the German camp extending beyond Warszawa Zachodnia station, were refuted by the National Polytechnic Institute.