Her article in thepeerage is here. A genealogical sketch is here.
From wbooks.com/winkel/diversen/mode/mode-bij-van-loon/; removed spots and fixed portions of left edge with Photoshop. Also posted to The Bustle Periods - 1870 to 1890 Album here.
What a gorgeous dress! The plant motifs are characteristically Worth. Her dress has a bustle, but it is not grotesquely huge.
Keywords: 1887, Worth, Cabanel, Louise Catharina Antoinetta van Loon-Borski, Borski family, van Loon family, Dutch, curly coiffure, earrings, fitted criss-cross bodice, pleated bertha, strap sleeves, vee waistline, bustle, bows, over-skirt, train, fan