Some of the articles and short stories that Harriet wrote in 1846 and 1847 formed the basis for a book that was published soon after she returned to England in 1848: Five years in Kaffirland: with sketches of the late war in that country to the conclusion of peace: written on the spot.
This book was well-received in a period of public interest in the "Kaffir War" or War of the Axe, and ran to three editions.
I do not own any of Harriet's works except for the book below.