On 9 September that year she married her cousin, the Norwegian agricultural school teacher, Anton Rosing (1828–67), and emigrated to Norway.
There, she met Fredrik Glad Balchen, a pioneer in deaf-mute education, who had developed a method for teaching deaf people.
Using the "pure speech method", it was first located in "Little Bloksbjerg", in Briskeby, Oslo, relocating three years later to "Høien" at St.
She was a member (the only woman) of the school commission set up by Minister Johan Sverdrup that was to prepare the Folkeskole Act of 1889.
Two school books were very successful, Barnets første bog (1879, and several editions thereafter) and Veiledning ved undervisning i samtidig læsning og skrivning efter lyd- og stavemethoden (Guidance on Teaching in Simultaneous Reading and Writing according to the Sound and Spelling method).
[1] With Fredrikke Marie Qvam, Gina Krog, Aasta Hansteen, and others, Rosing was a leader in Norway's woman suffrage movement.