She was the author of several books about the Holocaust, including The Destruction of Slovak Jewry (1961), the first authoritative description of the deportation and murder of the Jews of Slovakia.
Germany then dismembered Czechoslovakia, replacing it with the Protectorate of Bohemia and Moravia and a nominally independent Slovak state, which collaborated with the Nazis.
[2] She made a distinct contribution to documenting the Holocaust, specifically issues flowing from Germany's take-over of the democratic Republic of Czechoslovakia.
Gila Fatran wrote of Rothkirchen's first book, The Destruction of Slovak Jewry (1961), that "the trailblazing and dedicated work invested in it was reflected in its quality and exactitude".
[4] The latter book received praise for being one of the only works on its subject available in English, but also some criticism for overemphasizing the idea of Czech tolerance and presenting a one-sided view of Czech-Jewish relations.