Thanks, Stephen!
Such valuable information is not shameless plug! I am at the moment looking thru Baltimore's Afro-American Ledger, and from the early 1920's onward Ethel is mentioned almost in every edition. The Afro-American also had a tribute to these show girls sometime around 1940, I hope I saved that page as a pdf file, well worth reading.
Looking forward to your book.
Best,
Arne