 She died in Versailles in 1776 aged 37.In 1781, Lucas Gernler died from a stroke aged 77, leaving behind countless letters and a church hymnal; a year later, Anna Catharina, then 62, moved to Basel.Until her death she likely lived with her younger sister Anna Margareta Geymüller-Bischoff (1724–1804), who had married a wealthy trader.