Charles Robert Leslie and Tom Taylor. Life and Times of Sir Joshua Reynolds. London, 1865, vol. 2, pp. 468, 473, list Miss Elliott among those who sat for Reynolds in March 1784.
Frederic G. Stephens. English Children as Painted by Sir Joshua Reynolds. London, 1884, p. 74, as Lady Charlotte [sic] Bentinck, daughter of Mrs. Grace Dalrymple Elliott, in a cap.
Algernon Graves and William Vine Cronin. A History of the Works of Sir Joshua Reynolds P.R.A. Vol. 1, London, 1899, p. 80, describe it as a portrait of Lady Charlotte [sic] (corrected in vol. 4 to Charles) Bentinck.
Walter Armstrong. Sir Joshua Reynolds, First President of the Royal Academy. London, 1900, pp. 140, 194, lists "a little girl" in the 1785 exhibition, identifying it with the portrait Graves and Cronin call Lady Charlotte Bentinck.
Algernon Graves and William Vine Cronin. A History of the Works of Sir Joshua Reynolds, P.R.A. Vol. 4, London, 1901, pp. 1407–8, ill. opp. p. 1576 (from the engraving by J. Brown), catalogue it as Georgiana Augusta Frederica Elliott Seymour, Lady Charles Bentinck, a Royal Academy exhibit in 1785 (no. 423, "A little girl"), with biographical data and possible details of provenance.
B[ryson]. B[urroughs]. "European Paintings in the Jesup Collection." Metropolitan Museum of Art Bulletin 10 (May 1915), p. 88, ill. on cover.
Ellis K. Waterhouse. Reynolds. London, 1941, pp. 76, 97, 125 n. 250(b), pl. 250(b), as no. 423 at the 1785 R.A., Miss Seymour, Lady Charles Bentinck.
Millia Davenport. The Book of Costume. New York, 1948, vol. 2, p. 780, no. 2202, ill. p. 781 (cropped).
David Mannings and Martin Postle. Sir Joshua Reynolds: A Complete Catalogue of His Paintings (The Subject Pictures catalogued by Martin Postle). New Haven, 2000, vol. 1, p. 507, note the opinions of Graves and Waterhouse, both of whom identify "A little girl," exhibited in 1785, with this portrait of Miss Seymour, but point out that the work is no longer considered to be by Reynolds and that the "Age of Innocence" [no. 2008] may have been the 1785 exhibit.
Katharine Baetjer. British Paintings in The Metropolitan Museum of Art, 1575–1875. New York, 2009, pp. 84–86, 102, no. 36, ill. (color), fig. 67 (x-radiograph), attributes it to Reynolds and Workshop; publishes a new x-radiograph showing changes made by the artist in the course of execution.