Lady, said to be Sabine, Comtesse de Bassevitz by François Hubert Drouais (auctioned by Christie's)

The closest potential match is with Sabine Elisabeth Oelgard von Bassewitz, a writer rather than a composer.

From Google search; spots removed from background with Photoshop.

Lady, said to be Sabine, Comtesse de Bassevitz by François Hubert Drouais (auctioned by Christie's)

The center of Countess Sabine’s bodice is framed by prominent seams. The bodice is adorned with a lace bertha while the sleeves are decorated with lace engageantes.

Keywords:  Drouais, Sabine von Bassewitz, Countess, German, wavy coiffure, scoop neckline, lace bertha, elbow length close sleeves, lace engageantes, brooch, wrap

This site is for educational and information use. It is open for downloading and use without charge. I only ask that these images not be used for profit! I can be contacted at:  contactme@gogmsite.net.