Her best-known work is the series of books about "Plastuś", that began with Plastusiowy pamiętnik [pl] (1936).

the Diary of a Plasteline Man, about the adventures of a small red character made out of plastelne).

[1] By 1939 she published eight books,[2] including collections of short stories for children Bajowe bajeczki i świerszczykowe skrzypeczki, czyli o straszliwym smoku i dzielnym szewczyku, prześlicznej królewnie i królu Gwoździku (1935), Kukuryku na ręczniku (1936) and a stage play Cztery mile za pięć (1937).

[1][2] She continued publishing children's literature after the war: Kajtkowe przygody (1948), Tajemnica uskrzydlonego serca (1948), Dzieci z Leszczynowej Górki (with Zofia Malicka, 1952), Rogaś z Doliny Roztoki (1957), Szkoła nad obłokami (1958), Za żywopłotem (1971), Na tropach węża Eskulapa (with Kazimierz Garstka, 1980).

[1] In 1963 she also co-authored (with Maria Kowalewska [pl] a children's encyclopedia about nature, Głos przyrody.

[1] She received the: Her house in Warsaw became a small museum (Memorial Room of Maria Kownacka [pl]) open to the public in 1990.