Though FMG updated the webpage quite recently, it says Odo I and Berthe had 4 children. The page omits anything about a fourth child in the list. French Wikipédia shows Bertha de Bourgogne with a daughter named Agnes. I've seen several alternate names for Agnes, but Héloïse has not been among them. Overview shows several pedigree sites, but attention is sorely lacking with no primary and secondary source to validate Héloïse. With a great leap of faith, the Renaud FMG cites does not indicate "de Nogent" or that he was "Seigneur de Broyes, Beaufort, & de Pithiviers,"