The artist Henry Tanworth Wells had three sisters, of whom Augusta was the youngest. She was an art student at the South Kensington Schools. In about 1859, when this was drawn, there was a tenuous connection between Wells and Stocks, in that his wife Joanna and Stocks both drew the model Fanny Eaton (Maas Gallery and 16012) at about the same time. It seems to this art dealer therefore that the sitter, 'Miss Wells', was likely to have been Augusta.
Undoubtedly she is the same model as for Joanna Wells' (nee Boyce) painting La Veneziana of 1860 (destroyed, illustrated opp. p. 24 of Victorian Women Artists by Pamela Gerrish Nunn). Augusta stepped in to look after her brother's children after Joanna died in 1861