Jean-Baptiste-Camille Corot

Probably, Alfred Robaut, L'Oeuvre de Corot: catalogue raisonné et illustré, Paris, 1965, vol. II, p. 206, no. 590 (with slightly different dimensions, as Mme Robert mère)

Unlined. Very fine cracquelure visible under close examination. Under UV: inpainting to address frame abrasion at lower left and bottom edge and in darkest pigments in shadow of arm, fingers, hair, and eyebrows.
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Corot met Marie-Sylvie Robert during one of his trips to Rosny, where he would stay with her sister Madame Osmond. The artist became close with Madame Robert's son, François-Parfait Robert (1814 - 1875), for whom he painted portraits of both his sons: Louis (circa 1843-45, when he was threre or four years old, see: Robaut no. 589), and Maurice (in 1857, when he was four, see: Robaut no. 1052), both of which are held by the Louvre. Corot also painted the bathroom decorations in the Robert home in Mantes (1842). The present work was probably painted circa 1845.

Martin Dieterle and Claire Lebeau believe the present work to be no. 590 in Alfred Robaut's catalogue raisonné because the description matches exactly, though the dimensions are slightly different. For this reason they have titled the present work Portrait présumé de Madame Robert mère.