Career
A diabetic, Lassen was found dead at her Copenhagen, Denmark apartment on the morning of September 20, 1930. She is though to have committed suicide with a revolver which was found by her bedside. Among her admirers was Max Reinhardt.
Lassen was ranked first in the Danish ballet after she returned home from studying ballet in the United States and Paris, France, from 1921–1924.
She was tutored by Michel Fokine during her absence from Denmark.