Sitter studied at the Norwegian National Academy of Fine Arts at Oslo under Per Krohg, Axel Revold and Jean Heiberg from 1945 to 1946.
She trained at the Institut Supérieur des Beaux Arts in Antwerp from 1946 to 1950. She was a student of André Lhote during 1948 and with Stanley William Hayter 1954-55 and 1956–57. She conducted various study trips to Italy, Spain, France, The Netherlands, Belgium, England, Sweden and Finland between 1947 and 1962.
She was the recipient of numerous awards including Schäffers legat (1951), Ragnhild Keysers legat (1952), Helga og Hans Reusch' legat (1953), Fransk statsstipend (1956–57), Ragnar Moltzaus legat (1957), Hans Evensens legat (1960) and Th. Fearnleys Minnestipend (1961).
During her working career she settled in various countries, mostly in Norway, Italy and France. She was a resident in Antwerp 1947–50.[3]
She was a board member of Unge Kunstneres Samfund from 1952 to 1954, board member of Norske Grafikere from 1955 to 1958, and member of the Arts Council Norway from 1964 to 1968. She was appointed professor at the Norwegian National Academy of Fine Arts from 1981 to 1984. Among her works are wall decorations of the Government building in Oslo from the 1950s (in cooperation with her husband Nesjar and other artists).[4] Her works are included in the permanent collections of several museums, including the National Gallery of Norway and Henie-Onstad Art Centre in Oslo, at Moderna Museet in Stockholm, and at Statens Museum for Kunst in Copenhagen.[2]
Sitter was awarded the Prince Eugen Medal for painting in 1983.[5] She was decorated Knight, First Class of the Order of St. Olav in 1998,[2] and Commander in 2010.[1] She was awarded the Arts Council Norway Honorary Award in 2011.[6]
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