Ermangarde "Blanche" (of Anjou) de Bourgogne - Extra marriage ?

Her marriage to Richard Fitz Gerold does not fit with other sources and appears to be unsourced. According to sources given, Ermangarde was only married twice and was murdered with her second husband Robert I.

“Married to count Geoffroy of Gâtinais, she was a widow by late 1045 or early 1046 when her mother Hildegarde departed for the Holy Land. She then became the second wife of duke Robert I of Burgundy, probably not long afterward (since her daughter by that marriage was married in 1067), and died on the same day as her husband, 18 March 1076."

From Fran Whyte (Adams)