All that can presently (March 2021) be gleaned about Minnie Mario
from sheet music covers and by Internet searching is that she has been featured on 3 works published between 1890 and 1900.
She is listed towards the bottom of an 1888 Canterbury Theatre of Varieties, Lambeth. Variety Performance playbill and has several one-line mentions in various publication either as part of a sister act Dot and Minnie Mario
or singly as a leading pantomime star.
Surfers are welcome to contribute any further information about this performer.