Kammala jumla mai zuwa: Shugaban Jamhuriyar Poland ya nada Fleszarowa a 1935 don yin aiki a matsayin Sanata. A lokacin da ta ke aiki, ta mai da hankali kan tsari na yau da kullun na binciken kimiyya da kuma fadada 'yancin' yan ƙasa. A cikin 1937 ya kasance ɗaya daga cikin masu shirya Democratic Club na Warsaw, yana aiki a matsayin mataimakin shugabanta da Jam'iyyar Democratic Alliance. Zamanin Majalisar Dattijai ya ƙare a 1938 kuma a lokacin
A lokacin mamayar Poland, ta shiga cikin ƙungiyoyin ɓoye, tana shiga cikin Sojojin Gida. Yin aiki a cikin samar da bayanai da farfaganda ga Sojojin Gida, ta rarraba taswira da buga littattafai, ta kafa ofishin edita don rubuce-rubucen karkashin kasa. Ta yi aiki don ɓoye yahudawa, kuma ta jagoranci taron sirri na masu kula da ɗakunan karatu, tana jagorantar ƙoƙarin ɓoye bayanan tarihin Association of Polish Librarians. Fashewa daga garin kafin Tashin Warsaw a 1944, Fleszarowa ya tafi Lublin kuma ya yi aiki a matsayin mai tuntuɓar Kwamitin 'Yancin Kasa na Poland. A watan Oktoba na 1944, an nada ta shugabar Sashen Laburaren Ma'aikatar Ilimi.