Rubuta ci gaba ga wannan sakin layi - Shugaban Jamhuriyar Poland ya nada Fleszarowa a shekarar 1935 ya zama 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. Zaman majalisar dattijai ya ƙare a 1938 kuma a lokacin da aka mallaki Poland
, ta shiga cikin motsi na karkashin kasa, ta 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.