During this same period, Christensen began publishing poems in the journal Hvedekorn, and was guided by the noted Danish poet and critic Poul Borum (1934–1996), whom she married in 1959 and divorced in 1976.

[2] After teaching at the College for Arts in Holbæk from 1963 to 1964, she turned to writing full-time, producing two of her major early collections, Lys (Light, 1962) and Græs (Grass, 1963), both examining the limits of self-knowledge and the role of language in perception.

Her most acclaimed work of the 1960s, however, was It (Det), which, on one level, explored social, political and aesthetic issues, but more deeply probed large philosophical questions of meaning.

As with It, however, despite its highly structured elements this work is a poetically evocative series concerned with oppositions such as an outpouring of the joy of the world counterposed with the fears for and forces poised for its destruction.

Christensen also wrote works for children, plays, radio pieces, and numerous essays, the most notable of which were collected in her book Hemmelighedstilstanden (The State of Secrecy) in 2000.