After the war Rasiowa taught in a secondary school while her supervisor Lukasiewicz left Poland after the terrible suffering he had gone through. Mostowski however remembered Rasiowa's impressive work and persuaded her to return to the University of Warsaw to complete a second Master's Thesis under his supervision.
Pagkatapos ng digmaan Rasiowa nagtuturo sa isang sekundaryong paaralan habang ang kanyang mga superbisor Lukasiewicz kaliwa Poland pagkatapos ang kahila-hilakbot na paghihirap niya nawala sa pamamagitan ng. Mostowski subalit remembered Rasiowa's kahanga-akit ang kanyang trabaho at upang bumalik sa University of Warsaw upang makumpleto ng isang pangalawang Master's sanaysay sa ilalim ng kanyang pangangasiwa.