Biography
Daughter of Willem Pieck, Heer van Brakel, and Elisabeth Louisa van Aerssen. Married (1759) to Daniel de Wilhem. First cousin of Belle de Zuylen on her mother's side.
Life with Boswell
Boswell dined at the Wilhem's on December 26, 1763. Apparently, Madame de Wilhem was somewhat critical of Boswell's Utrecht acquaintance, the Countess of Nassau Beverweerd. He visited the Wilhem's on a couple of other occasions during his stay in Holland.