Bertha de Vries was the daughter of Gompert de Vries and Rachel Trompetter. She moved from Amsterdam to Doetinchem in June 1940.
Amsterdam Municipal Archives; record card of Bertha de Vries
This person is commemorated on a memorial in Doetinchem. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.