All that can presently (March 2023) be gleaned about
Marie Flynn, presumably an American singer/actress, from sheet music covers and by Internet searching is that she has been featured on just one work namely
My Faultless Pajama Girl (1917) music by
Louis H. Fisher, and published by
Jerome H. Remick & Co., New York & Detroit, USA
She is known to have had a leading part in
Victor Herbert's
The Velvet Lady (1919), a musical comedy where she played
Ottilie, a bride. The comedy opened at the New Amsterdam Theatre, New York, on 3 February 1919.
Surfers are welcome to contribute any further information about this performer.