Bergroth was known to have been linguistically gifted. She wrote in Swedish until 1920, translated English and French literature to Finnish and also spoke German. She is best remembered for having written popular plays
Anu ja Mikko and
Kuparsaare Antti using a
Karelian dialect. During her career, she released around 70 books, including novels, memoirs, children's stories and poems. Bergroth was also noted for collaborating five times with film director
Valentin Vaala. Using the pseudonym Tet, she wrote the film scripts for
Morsian yllättää (1941),
Tositarkoituksella (1943),
Dynamiittityttö (1944),
Vuokrasulhanen (1945) and
Viikon tyttö (1946). All of those films were light-hearted comedies starring the actress
Lea Joutseno. ==Later life==