writer best known for her book Station Life in New Zealand (1870), a lively account of life in colonial New Zealand.

Stewart was educated in England, and at age 21 she married George R. Barker, then a captain of the Royal Artillery. He was knighted for his military service in 1860 but died shortly thereafter. In June 1865 she married Frederick Napier Broome, an Englishman who had immigrated to New Zealand seven years earlier, and, leaving behind her two children by Barker, she embarked with Broome for New Zealand. After three “supremely happy” years there, the couple sold their sheep farm and returned to England. Barker's Station Life, which sold well and was translated into French and German, was followed by 10 other books written in London, including A Christmas Cake in Four Quarters (1872), about Christmas Day in North Canterbury (on South Island, N.Z.).

In 1875 she joined her husband, who had been appointed colonial secretary of Natal (S.Af.), later accompanying him to Mauritius, Western Australia, Barbados, and Trinidad and writing of these experiences. Broome was knighted in 1884, and Barker published the last of her 22 books, Colonial Memories (1904), as Lady Broome.