Harriet Rebecca was the first daughter, after seven sons, born to Henry James and Rebecca. 
eGGSA library Gravestones in South Africa Eastern Cape : Urban area Eastern Cape, FORT BEAUFORT, Main cemetery ESTMENT Harriet Rebecca nee LLOYD - 20 Mar 1900 aged 71 years. 
↑ Source:"The Family of Henry James and Rebecca Lloyd" Research done and family history book handwritten by Margaret Lloyd of Grahamstown in 1984 and currently held at Albany Museum, Grahamstown, Cape, South Africa. Seen and entered March14, 2016 by Gwyn (Lloyd) Johnson
It may be possible to confirm family relationships with Harriet by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Harriet: