Frida Uhl-Strindberg was an Austrian writer, translator and cultural entrepreneuress, who lived in London between 1908 and 1914.
About 1910 she was involved with W.T. Spencer and Messrs Dowdeswell in transactions regarding a large number of damaged canvases, which may or may not have originally been Whistler's, but of which the authenticity was in doubt.
Pennell, Elizabeth Robins, and Joseph Pennell, The Whistler Journal, Philadelphia, 1921 , pp. 125-136; Monica Strauss, Cruel Banquet: The Life and Loves of Frida Strindberg, New York, 2000.