Elżbieta Stanisława Alicja Janowska Moniuszko was born in Warsaw in 1954 and still resides in the city. She is one of the over sixty direct descendants of Stanisław Moniuszko (1819–1872). She is a fifth generation descendant of the composer. Through her mother Danuta Maria Moniuszko-Janowska (1922-2005) her ancestry traces back to Moniuszko's son Stanisław (1843–1905). Her father was Janusz Paweł Janowski (1902–1982), a painter. She is the mother of Adrianna Janowska-Moniuszko, an actress based in Szczecin.
In May 2018 Elżbieta Stanisława Alicja Janowska-Moniuszko co-founded the Stanisław Moniuszko Foundation, along with other direct descendants of the composer in Poland.
Between 1973 and 1978 she worked at the Humanities Institute (Sport Psychology Department) of the Warsaw Academy of Physical Education. From 1978 to 1984 she served as translator at the Cuban embassy in Warsaw. From 1984 to 2016 she worked at the Chancellery of the Sejm, where she was responsible for foreign relations.
Having retired, she still works as a Spanish translator and interpreter. She interpreted for the Polish president during the first official visit by King Juan Carlos I of Spain and Queen Sofia to Poland.
She is a recipient of the Polish Presidential Medal for Long Service and the Order of the Star of Italian Solidarity (2nd Class/Commander).
As a child, she practiced ballet, the violin, horse jumping (CWKS Legia), and track and field.