One of Sweden's most prominent Expressionists, she is remembered in particular for her paintings of children, including her daughter Ginga, and for her landscapes, often scenes of Öland where she spent her summers.
In 1910, she studied in Paris under the Cubist Henri Le Fauconnier at the Académie de La Palette and at the city's Russian art colleges.
Her landscapes of Öland with their bold colours and shapes attracted considerable interest from the critics who welcomed her Expressionist flair.
Under the influence of the Spanish civil war in 1938, she painted the monumental Penning contra liv (Money Versus Life), revealing her anti-war feelings.
In the 1940s, she settled into a permanent home in the Söder district of Stockholm where she produced several works titled Gubbhuset depicting scenes from her window.
[1] While in Paris after the Second World War, Nilsson became actively engaged in the anti-war movement, selling Citoyen du monde on the streets.