18thC/19thC lady

Unknown young woman, 18th century, oil on linen 28 x 22.7cm. Purchased from Sir Bruce Ingram, 1963. © Government Art Collection (1443)
This portrait, formerly thought to depict Lady Emma Hamilton, is in the UK Government Art Collection. Any thoughts regarding the sitter’s identity and artist attribution is appreciated – please use the ‘add a comment’ facility below.
Zoom in on this picture on the GAC website.