Catherine married Johannes Zimmermann on April 20, 1847, a critical union for her mission work.
Catherine Mulgrave married Johannes Zimmermann on April 20, 1847, in Christiansborg. This marriage was noted as an exemplary intercultural partnership within Basel Mission's objectives and significantly amplified her influence and effectiveness in educational missions. Their union became symbolic of cross-cultural cooperation in missionary work, intertwining personal and joint ambitions for elevating the quality and reach of education provided by the mission to young African women. Together, they functioned as a key cog in the mission's progress, significantly enhancing educational structures in the region.