All that can presently (December 2022) be gleaned about Theresa L. Bluford 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 My Susie (1901) music by John Hopkins Densmore, words by John W. Parks and published by Parks & Densmore, Boston, Massachusetts, USA
Her portrait on the left is taken from that same work.
Surfers are welcome to contribute any further information about this performer.