There are 6 titles associated with this person.

Barnby, Mrs.. The Rock; or, Alfred and Anna. A Scottish tale. Maidstone: 1801.
Jullien, Jean-Auguste. Kerwald Castle. A Novel. In two volumes. From the French, by Mrs. Barnby. London: Minerva Press, Lane, Newman, and Co., 1804.
Barnby, Mrs.. The American Savage; or, Orab and Phoebe. By Mrs Barnby. London: George Robinson [iii], 1808.