Intent on social and political reforms for women, she successfully fought for a wife's right to dispose of her own earnings.
[1] From 1871 to 1873, she was a member of the board of the Danish Women's Society where she fought for changes in the marriage laws.
She successfully involved the jurist Carl Goos (1835–1917), encouraging him to work with the pacifist politician Fredrik Bajer who stood for a wife's right to dispose of the income she had earned.
With the support of the Danish Women's Society, new legislation along these lines was introduced on 7 May 1880 under the so-called Bajer's Law (Bajerske lov).
[2] A talented public speaker, Casse was one of the oldest and most respected members of the Danish Women's Society.