"A portrait of a lady seated in a chair", Charles Beaubrun
Presumed portrait of anne marie louise d'orléans (1627-1693)
identification proposed by user ecummenic (talk) based on the comparison with some portraits of that princess (see images below). Date: mid 17th century. Dimensions: height: 95.3 cm (37.5 in); width: 74.9 cm (29.4 in). Medium: oil on canvas. Collection: Unidentified location. Circle of Charles and Henri Beaubrun - A portrait of a lady seated in a chair