The terrain suggests this is not the Bonneval southwest of Paris in the Beauce region, but Bonneval sur Arc in the Rhône-Alpes region near the Italian border.
From the-athenaeum.org/art/full.php?ID=138625#.
The curvaceous comtesse uses a vest to shape her dress in this 1800 Girodet de Roucy-Troisson portrait.
Keywords: 1800, Girodet de Roucy-Troisson, comtesse de Bonneval, Countess, straight coiffure, bangs, ribbon headdress, curly bun, laced vest, strap neckline, dress, scoop décolletage, long upper puffed tight sleeves, arm bands, cuffs, no waistline, close skirt, bracelets, wrap