Mary Anthony, the wife of Charles Gifford Dyer (1851-1912) American painter best known for his landscpae paintings Italy, Egypt and Syria.
Older than Sargent, Dyer had studied in Paris under Jacquesson de la Chevreuse and had entered the Royal academy at Munich in 1871.
Dyer spent most of his professional life between Munich and Paris with six winters in Rome, four summers in Venice, and prolonged working tours in Egypt and Syria.
John Singer Sargent, An Exhibition -- Whitney Museum, NY & The Art Institute of Chicago 1986-1987