The von Frisching-von Wattenwyl family was located in Switzerlad. A genealogical check of the family turned up a possible name, Barbe Suzanne Brun.
From tansey-miniatures.com/sammlung.
This miniature shows late 80s coiffure and style persisting to 1790.
Keywords: 1790, Desvernois, Frau von Frisching-von Wattenwyl, straight bouffant coiffure, ribboned lace-trimmed hat, fichu, high neckline