Her novel Skriva í sandin is a contemporary book for young adults, taking place in Kjelnæs's hometown of Tórshavn.
[1] She wrote lyrics and cooperated with singer Eivør Pálsdóttir and DR Big Band on the musical composition At the Heart of a Selkie.
(2016) Lyrics for Eivør include among others: Jarðartrá, Upp úr øskuni, Purpurhjarta, Enn, Gaia, Ein klóta, Verð mín, Salt, Slør, Elskaði, Mánasegl, Gullspunnin, Stirdur saknur, The Swing.
Recent work includes the novel Óendaliga vera, published in 2016, and the script for the film Dreams by the sea, directed by Sakaris Stórá and released in 2017.
Kjelnæs has been nominated for and has received both national and international awards, and some of her work has been translated into the other Nordic languages, as well as into English, German and French.