As an illustrator and a writer, she contributed to Berlingske Tidende and as a textile artist, created designs for Emilie Tolle's weaving enterprise.
She was raised in a cultivated, well-to-do home together with her younger brother Even (1879–1949) who became a cleric, social economist and writer.
[4] In March 1905, she married the physician Nields Reinhold Blegvad (1880–1970) with whom she had four children: Viggo, Inger (1911), Jørgen (1911) and Jacob (1921), who became an architect.
From 1901 to 1906, she studied sculpture at the women's school attached to the Royal Danish Academy of Fine Arts.
In addition to her busts and her painted portraits, Marstrand also created textile designs from the late 1920s, especially for the weaver Emilie Trolle.