All that can presently (November 2024) be gleaned about
Dolley Marshell from sheet music covers and by Internet searching is that she was presumably an American actress/singer who has been featured on 2 works published in 1911.
Her portrait on the left is taken from
The Ragtime Violin! (1911) words & music by
Irving Berlin, and published by
Ted Snyder Music Co., New York, USA.
Surfers are welcome to contribute any further information about this performer.