 Her brother Charles Coxen also immigrated to Australia, where he and his wife Elizabeth Coxen, who were also interested in natural history, became members of the Queensland Philosophical Society.While in Australia, Elizabeth made hundreds of drawings from specimens for the publications "Birds of Australia" and "A Monograph of the Macropodidæ", or "Family of Kangaroos", as well as illustrations for the ornithology volume of Charles Darwin’s "Zoology of the Voyage of HMS Beagle".She bore one son while living in Australia, and gave birth to their eighth child when they returned to England in 1840.