Hamerschlag's husband received an assignment in Palestine in 1934, she accompanied him and exhibited in 1935 in Jerusalem. The couple moved to London in 1936, where Hamerschlag worked as a portraitist and book illustrator, publishing illustrations in numerous magazines and newspapers. Her son Raymond F. was born in 1937. With the "Anschluss of Austria" broke off the connections to the homeland. Not until the end of the Second World War did Hamerschlag change her surname to Berger-Hamerschlag and often signed with Berger. She participated in numerous group exhibitions in England. In addition to her painting, she wrote novels, short stories, and an autobiography. In 1950 she began to teach in youth clubs and published her experiences there in 1955 in her most famous work "Journey into a fog" with own illustrations.