Weis, Ancestral Roots, says she was Aremburge, daughter of Henry, Count of Nevers, and Duke of Burgundy.
It appears that amongst the many merges leading to this article the name Vergy was taken, with a note placed to say it would be put in this way and marked uncertain.
In fact, this profile for the mother of Gervaise II, d. ca. 1095, lord of Château-du-Loir is the subject of an article on the Henry II website of Stewart and Farmerie. They state very simply:
They give more information about her family on the article for her husband, Robert "Brochard" de Château-du-Loir.[2]
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V > Vergy | D > de Semur > Aremburge (Vergy) de Semur
Categories: European Aristocrats, Unsourced Profiles | Uncertain Family
Since a profile for Elisabeth already exists (Loire-4, misnamed), I am removing all the incorrect connections to the Château-du-Loir family and keeping this as Aramburge - whose parentage should be unknown.
Since there are two sons named Gervase/Gervaise here, perhaps they are the same person and his DOB is c1030, which makes the chronology plausible.
If she was living as stated in the Bio, then she was unlikely to have been born in 980.