As an adult, she was active as a music and language teacher in Stockholm for many years, and remained there until her death.
This part of their education had previously been provided by the head of the Royal Dramatic Training Academy, and the students had been housed as boarding school students in the home of Christina Fundin (mother of Wilhelmina Fundin), but the boarding school of Fundin was closed in 1846, and Brooman was employed to provide the elementary education schooling to the students.
Hanna Brooman provided instruction in Christianity, Writing, piano forte, French, German, Italian, history and geography for both male and female students, as well as sewing and needlework for the girls.
Erik af Edholm described her as "a good teacher and person" (1869), and Frans Hedberg described her in his necrology: Hanna Brooman was also active as a composer and translator.
Her compositions have been described as: "weak, melodic bits of atmosphere, good representatives of the Swedish Romantic lieden of the 1830s- and 40s.