Her novellas were published in Głos Poranny, Dziennik Ludowy, Górnik, Myśl Socjalistyczna and Nowa Kwadrydza.

[2] After the war started (1939) she was living in Warsaw Ghetto, where, from 1940, she worked for the Judenrat as a telephonist and typist in the Jewish District.

[4][5] The people she worked with included the writer Marcel Reich-Ranicki who wrote about Jarecka in his 1999 book.

[6] She was a member of underground organization Oneg Shabbat, and was asked to write about what she was seeing by Emanuel Ringelblum.

[9] She is attributed with writing the report describing the Grossaktion Warsaw titled Ostatnim etapem przesiedlenia jest śmierć (The last stage of resettlement is death).