By January 1, 1848, Catherine had established a girls' school in Christiansborg.
On January 1, 1848, Catherine Mulgrave led the establishment of one of the earliest girls' schools under the Basel Mission in Christiansborg. Her role in founding the girls' school was instrumental, emphasizing structured education, religious teachings, and literacy for young African girls. Catherine's efforts directly addressed the conservative restrictions within the society that underestimated the importance of women’s education. This educational framework she fostered encouraged and empowered numerous African girls, informing a new wave of educated African women who would contribute to various social reformations locally, resulting in lasting impacts on female literacy in West Africa.