Mrs Freer, née Hecker, sister-in-law to the Detroit collector Charles Lang Freer. She married Freer's youngest brother in November 1891.
She is mentioned briefly in JW's correspondence (#01503).
Merrill, Linda, With Kindest Regards. The Correspondence of Charles Lang Freer and James McNeill Whistler, 1890-1903, Washington and London, 1995.