Godefroy de Romance-Mesmon had an unwed partner, Jeanne Mercier, and then he married Angélique Le Roy de Senneville iin 1782. I am guessing that this is Angélique. The Tansey caption dates this to ca. 1780, but they married in 1782 so I revised the date to ca. 1782. Angélique’s genealogical sketch is here.
From tansey-miniatures.com/sammlung.
Angélique’s coiffure towers above a large bow in this miniature. The boy appears to conceal a zone bodice.
Keywords: 1782, Dumont - François, Angélique Le Roy de Senneville, Le Roy de Senneville family, de Romance family, French, high straight large curl coiffure, floral headdress, ribbon headdress, bodice, square neckline, lace bertha, bows, close sleeves, lace arm bands