All that can presently (March 2021) be gleaned about Rosalie Jacobi from sheet music covers and by Internet searching is that she has been featured on just one work namely The Swallow and the Exile (1907) music by Kenneth Lyle, words by Shirley Ilton and published by Reeder & Walsh, . She is pictured on the front cover of the sheet music. The portrait on he left is taken from a postcard dated 2nd May, 1906.
Elsewhere it is said that she appeared in Herod (1900) at Her Majesty's Theatre, London and was praised as a talented child actress.
Surfers are welcome to contribute any further information about this performer.