All that can presently (June 2022) be gleaned about Gwendoline Brogden from sheet music covers and by Internet searching is that she was an American actress/singer born in Hull and has been featured on 3 works published between 1914 and 1918.
As a child, she made stage debut in London in Bluebell in Fairyland (1901), followed by a number of other productions.
Surfers are welcome to contribute any further information about this performer.

This list is derived from information provided by Monologues.co.uk which went down sometime in 2023.
The loss of this valuable resource is very sad and a mystery.