All that can presently (December 2022) be gleaned about
Gertie Gilson from sheet music covers and by Internet searching is that she was presumably an American actress/singer who has been featured on 3 works published between 1895 and 1901.
Her portrait on the left is taken from the sheet music cover of
She's the Daughter of Officer Porter (1896) music by
George Maywood, words by M.E. Rourke and published by
Whaley - Royce & Co., Toronto, Ontario, Canada. The cover describes her as "The Inimitable Comedienne",
Surfers are welcome to contribute any further information about this performer.