As its leader from 1904, she developed the Friends of Handicraft association into the country's top textile producer, creating a new production technique in collaboration with Maja Sjöström.
Thanks to a travel grant, in 1891 together with Widebeck she spent three months in England where she took special interest in the work of the textile designer William Morris (1834–1896), thereafter adopting his approach to arts and crafts In Sweden.
[1] It was under her leadership that several of Sweden's most significant textile artists were employed as designers; they included Maja Sjöström, Agda Österberg, and Annie Frykholm [sv].
[3] Together with Sjöström, Wästeberg developed a simplified weaving technique in 1905, producing upholstery much more quickly.
One of Wästberg's most outstanding creations was her haute lisse linen Värdinge fuga in 1904 which was bought by Queen Victoria at an exhibition in St Petersburg in 1908.