Bojarska began her scientific career at the Institute, as the research aid to Professor Karol Pospieszalski in 1958–1966, director of the Research Department of History of Nazi Occupation of Poland ("Zakład Badania Dziejów Okupacji Hitlerowskiej w Polsce"). She was traveling between Potsdam and Magdeburg, collecting data about the fate of Poles during the genocidal Intelligenzaktion Pommern. Since then, she wrote numerous publications on the subject widely cited by Polish as well as German historians. Her first ground-breaking research into the Massacres in Piaśnica was published in 1964 when still little was known about it. Her subsequent Piaśnica monograph was released by Zakład Ossolineum in Wrocław in 1978 and since reprinted several times.