All that can presently (July 2024) be gleaned about
Maraget Kingore from sheet music covers and by Internet searching is that she was presumably an English actress/singer who has been featured on 3 works published between 1900 and 1901.
Her portrait on the left is taken from
Sweet Irene (1900) music by
E.S. Phelps, and published by
E. T. Paull Music Co., New York, USA.
She was also the one-off composer of
With You (1905) published by
Chicago Sunday American, Chicago, Illinois, USA.
Surfers are welcome to contribute any further information about this performer.