Biography
Daughter of Reinout Gerard van Tuyll van Serooskerken (1677-1729) and Isabella Agneta Hoeufft van Fontaine Pereuse (1683-1725). Belle de Zuylen's aunt and godmother. Married (1730) to Diderik van Lockhorst (d. 1755), Heer van Ter Meer en Maarssen.
Life with Boswell
Boswell played whist at Madame Lockhorst's on February 21, 1764.