From what I can gather, she may be the wife of Karl Weitz von Eschen.
From malerei19jh.museum-kassel.de/show.html?nr=7&id=31050&ku_id=228&ku_nr=11&sort=W; increased exposure somewhat.
The Baroness is somberly dressed with a bonnet cap and lace veil and a gray redingote for her 1816 Weygandt portrait.
Keywords: 1816, Weygandt, Sophie Waitz von Eschen-Rheinfarth, Baroness, German, curly coiffure, bonnet, lace veil, bodice, lace collar, high round neckline, long under-sleeves, cuffs, ruffles, redingote, long upper puffed close over-sleeves, belt, Empire low waist band, close skirt, gloves