She is married to Gerrit van Calcar.
Permission for the marriage has been obtained in Deventer on September 23, 1758.Source 2
They were married in church on October 15, 1758 at Deventer, she was 20 years old.Source 123-9-1758 Gerrith van Calcar en Steijntje ter Horst bijde van Deventer. Op att.van Groningen. Att.geg. op het Stadhuis den 14 okt. 1758.