All that can presently (December 2022) be gleaned about Attie Spencer
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 1897 and 1900.
Her portrait on the left is taken from She's a Princess Just the Same
(1900) music by Frederic V. Bowers
, words by Charles Horwitz and published by Hill, Horwitz & Bowers
Surfers are welcome to contribute any further information about this performer.