Her father, Lancelot Henry William Foster, made syphons and her mother was Mary Aldridge (born Leetham).

[3] She met Blanche Badcock,[1] a driver in the Army Service Corps,[4] and after the war they set up a poultry farm and home together.

[1] Around 1925, she visited Bisley, where she met George Fulton, the winner of the 1888 Queen's Prize who owned an armourer's shop on the site.

[5] In October 1925, she persuaded Badcock to take up the sport,[6] and they both joined the South London Rifle Club at Bisley, the only one which accepted women.

[7] The most prestigious competition for shooting was the King's Prize which was an annual event that had been won every year since 1860 by a man who was or had been a member of the armed forces.

[1] In 1929, Foster became the first person to shoot a perfect score on the newly resized Bisley targets, which had smaller bullseyes than those previously used.

[13] She also received a telegram of congratulations from George V, calling her success "a wonderful achievement in the history of rifle shooting [which] will be universally acclaimed".