[1] De la Croix was baptized on 3 January 1756 in the Oude Waalse Kerk in Amsterdam as Susanne, daughter of French painter Pierre Frédéric de la Croix and Marie Regnier.

From this marriage seven children were born, among whom Pieter Gerardus (1776–1839), Maria Margaretha (1780–1862) and Georgius Jacobus Johannes van Os (1782–1861), who also became painters.

[4] In their Geschiedenis der Vaderlandsche Schilderkunst they write: "Susanna de la Croix, who was the daughter of the painter of that name, who has made herself known through the manufacture of a number of crayon portraits, and who is deaf-mute.

[6] A portrait of an old woman in the collection of the Rijksmuseum Amsterdam is assigned to Susanna de la Croix, but it is dated a few years after her death.

[7] De la Croix died of smallpox at the age of 33, she was buried in the Nieuwe Kerk in The Hague.