Found this bio in book entitled: "American Women" Vol. I. (Mast, Crowell, Kirkpatrick, 1897).
GROENEVELT, Mrs. Sara, litterateur, was born on the "Bon Dieu", a cotton plantation of her uncle, F.G. BARTLETT, which was romantically situated on a bend of the Red River called Bon Dieu, near Natchitoches, LA.She is the daughter of Dr. Sylvanus BARTLETT, of Maine and Julia Finch GRESHAM of Kentucky.Mrs. Groenevelt is a cousin of the late Washington journalist, Ben. Perley POORE.At the age of fifteen she was graduated from the girl's high school of New Orleans.A few years later she became the wife of Eduard GROENEVELT, a descendant of the old Dutch noble Baron Arnold de Groenevelt, of Netherland fame.Shortly after her marriage she accompanied her husband to Europe, where she spent several years, completing her musical education under the careful guidance of Moscheles, Reinecke and other masters.She was the only lady solo-player at the Haupt-Prufung of the Leipzig Conservatory of Music, held in the Gewandhaus, 2 May 1867, where she played with success Moscheies Concerto for pioano, accompanied by the famous Gewandhaus Orchestra, Moscheles himself leading.Mrs. Groenevelt has written under various pen-names, and her poems have received recognitoin from the "Times-Democrat" of her own State, and also form the Chicago "Current" for which later she wrote under the pen-name: "Stanley M. BARTLETT".Her home is now in New Orleans, LA.
___________________________________________ I also have an electronic portrait of her I can send by email.