The document is just a census record with hardly any sigificant data. It lists Martha as daughter of Friedrich (head of housshold) and Marie Kaminskÿ (his spouse), in 1900 residents of a village named Mollenstorf in the Mecklenburg-Schwerin area of Germany.
Marie Kaminskÿ is probably widow of Schluck, as Franz Schluck is listed as step son.
More promising are the ship manifests of the Stein family. Researching them at the Ellis Island site I found two interesting records of a Martha Stein, 1927 and 1932.
The 1927 record has as contact (home) husband Arno Stein, Michaelisstr 38 in Breslau, and final destination mother Emilie Kamisni, Brookline Mass 119 Westbourne. Also states she was in the USA before, 1923 Boston, and that she was 48 years of age and born in Dresden, Germany.
The 1932 record also has husband Arno Stein as contact, now living at Mathiasstr. 10 in Breslau. This time her final destination was sister Hedee Rosenblum, 17 Abbort Str Boston Dorchester Mass. Also states she was in the USA before, 1927 Mass, and that she was 53 years of age and born in Dresden, Germany. The destination is the same as that of son Helmut when he traveled in 1934 to his aunt Haidu Rosenblum.
The really fun part is the 1921 passport application of mother Emilie Kaminsky (with photograph on image 219):
"United States Passport Applications, 1795-1925," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:QV5Y-TT78 : 4 September 2015), Emilie Kaminsky, 1921; citing Passport Application, Massachusetts, United States, source certificate #66109, Passport Applications, January 2, 1906 - March 31, 1925, 1692, NARA microfilm publications M1490 and M1372 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,674,149.