She was born in Manhattan, New York on February 21st, 1867.
She was the daughter of Henry Strouse (b. 1851) and Hannah Mork (1846 - 1914). Her father, a merchant, hailed from Germany whilst her mother was a native of Kentucky born to German parents and they had married in Jefferson, Kentucky on May 28th, 1863. She had two siblings, her elder sister Tillie (b. 1864, later Mrs Max Thorn) and younger brother William (b. 1876).
Blanche appears with her family on the 1880 census living in New York City. She was married in Manhattan on 5 May 1887 to Leo David Greenfield (b. July 19th, 1863), a furrier born in New York City to Bohemian parents. Their only child, William Bertram, was born on May 11th, 1888. The small family lived together with Blanche's mother in Manhattan, appearing there on both the 1900 and 1910 census records and Leo ran Leo D. Greenfield & Co Inc., a manufacturer of ladies' fur garments.
The Greenfields were frequent travellers and Blanche boarded the Titanic at Cherbourg with her son William who had been in Europe on business. They held ticket number PC 17759 which had cost £63, 7s, 2d and occupied cabins D-10/12. On the night of the sinking they were rescued in Lifeboat 7, the first lifeboat to leave the ship.
Upon arrival in New York, one step that Mrs Greenfield took, out of respect for those lost, was to postpone her silver wedding celebrations planned for May 5th.
For the rest of her life Blanche was haunted by the screams of those who died in the icy waters and her exposure to the icy elements in the North Atlantic affected her hearing in later years. Undeterred by her experiences though, she continued to travel frequently and one voyage in 1921 was aboard Olympic. Other ships she travelled aboard included Amerika, Lafayette and several trips aboard Leviathan.
She was widowed on November 27th, 1934 and returned to Manhattan where she died on November 5th, 1936. Blanche and her husband are buried at the Salem Field Cemetery in Brooklyn, New York.