Career
She was born in Borgund. She was elected to the Norwegian Parliament from Rogaland in 1965, and was re-elected on four occasions. She had previously served in the position of deputy representative during the terms 1958–1961 and 1961–1965.
Tusvik was involved in local politics in Askvoll, Time and Voss, serving as deputy mayor of Time during the term 1963–1967.