All that can presently (December 2022) be gleaned about Clarissa Agnew from sheet music covers and by Internet searching is that she was presumably an American actress/singer who has been featured on just one work namely Wheeling, Wheeling (1895) music by Frank P. Banta, words by Jess Danzig and published by Howley, Haviland & Dresser, New York, USA
Her portrait on the left is taken from that same work.
Surfers are welcome to contribute any further information about this performer.