Dantzig was a Dutch Jew who came to London to study. She returned to the Netherlands intending to help her family flee the Nazis. Instead she was captured and killed in Auschwitz, with most of her family.
From Holocaust Map: "Morwenna Blewett, who initiated the campaign to install Britain’s first Stolperstein writes: 'Ada (Anna) van Dantzig was a Dutch paintings conservator. She worked with National Gallery Consultant Restorer, Helmut Ruhemann CBE, at his private studio in Golden Square, Soho, sometime between 1934-39. At the outbreak of war in 1939 Ada left London to try to rejoin her family in the Netherlands. Her family were preparing to escape to Switzerland. Despite pleas from her friends and colleagues to stay in London Ada rejoined her family in Rotterdam. They left Rotterdam in early 1943. She was arrested in France along with her mother, father, sister Jenny and brother Paul. On 11th February 1943 she was deported from the transit camp Drancy to Auschwitz. She was murdered on the 14th of February 1943. Her parents were murdered on the same day. Her sister Jenny had been murdered on the 1st of February 1943. Her brother Paul was murdered on the 30th April, 1943. Her youngest brother, Hugo, was able to escape to Switzerland with his uncle, aunt and their two children.' "
