Roos was born to
Postmaster General Adolf Wilhelm Roos and Sophie Maria Roos née Nordenfalk in 1862 in
Stockholm,
Sweden. She was the granddaughter of Minister of Justice
Johan Nordenfalk. Roos was the only girl in her family and had a tumultuous upbringing, reflected in her work. Her childhood summers were spent with her grandmother, Baroness Maria Nordenfalk, at
Blekhem. She was said to have been a voracious reader and learner. She was educated at the
Högre lärarinneseminariet in Stockholm in 1879–1881. Roos was involved in the arts but her passion was for writing. Roos was a popular children's author, illustrator and songwriter. Her best-known books are and (from ), set in the village of Kålåkers in Törnsfall parish in eastern
Småland; her mother was born and raised at Blekhem in Törnsfall, where her family had roots. The books were part of the series , published by and
Fridtjuv Berg. Roos also wrote children's songs, such as
Blåsippan ute i backarna står and , and she was also a playwright, writing both story plays and short historical scenes for children. She was an early member of the women's association
Nya Idun and was the president of the literary society
Samfundet De Nio. Roos was editorial secretary of cultural journal '''' from 1898 to 1902. She died in
Bombay,
India, in 1938. ==Spiritual healing==