All that can presently (May 2022) be gleaned about
Ada Fawn from sheet music covers and by Internet searching is that
she was presumably an English actress/singer who has been featured on 2 works published between 1908 and 1920.
Form a press cutting by she is known to have performed
Poor Old Father (1920) words & music by
Fred Godfrey, co-author
Bennett Scott, and published by
B. Feldman & Co., New Oxford St., London W.C., England at The Hippodrome, Belfast in (August 1920).
Surfers are welcome to contribute any further information about this performer.