Gertrud Abraham was born in Hamburg on February 2, 1898, the daughter of Moritz and Jenny (Jeannette Sara) Abraham-Porges. In April 1939 she fled her country and went to live in Rotterdam. The occupation listed is 'maid'.
In October 1940 she came from Statenweg 155c in Rotterdam, at the same time as her mother Jeannette Sara Abraham-Porges (see under Porges) and the family of her sister Ilse Victor-Abraham (see under Victor), who had left Van Beuningenstraat there, to Blaricum where it was The entire group first stays briefly in a guest house at Matthijssenhoutweg 1e and then moves to Bussummerweg 33. The widow Guthsmuth-Bermann also lives at that address (see there). I don't know if it was somehow related to the Porges-Abraham family or if it happened to live there.
On July 8, 1942, Getrud had to move to Amsterdam where she registered at Albrecht Dürerstraat 20hs. Administratively as of December 30, 1942 - but in reality it must have been much earlier - she was taken to Westerbork. She is deported to Auschwitz where she is murdered on September 7, 1942.
A Stolperstein for Gertrud Abraham was placed at Haynstraße 13 in Hamburg in 2014.
Source: Ron van den Berg
The story is part of the document '1942: Blaricum, its Jewish inhabitants and how they fared'. Can be found under https://hdl.handle.net/21.12143/301823155 on the Gooi en Vechtstreek Archives website.