But...does it say niece on what side? Mother or father? Sorry I am probaböy too tired for research now, but I find this at least, maybe it will give hints where to lead. I don't see how other genealogy sites make good sources on their own... This was automatically translated by google:
"From the noble family and the Duchess (Hhenbourg 1.3.690?).
She was the mother of Saint Odile and the wife of Etionon, Duke of Alsace under Dagobert II and the maternal aunt of Saint Léger, Bishop of Autun. When Odile, a blind-born girl, came into the world, she secretly handed her over to a nurse who brought her to Baume-les-Dames, in a monastery, for the father wanted to destroy this child. With her husband, Bereswinde later participated in the founding of Ebersmunster Abbey and led a discreet and pious life, a more discreet life even more discreet after the death of her husband. It seems to have been venerated as a saint in Hohenburg and preserved relics of it were even exhibited in the 12th centurye. at Strasbourg Cathedral. This is a result, the Cantatorium of the Cantor of the Cathedral, a book which was not known until 1928. His relics have disappeared over the centuries. If no image of it is preserved, it is represented on the famous carpet of Saint Odile in Saint-Étienne in three scenes: during the birth and baptism of Saint Odile and on the death of Etipon. His stone sarcophagus was from 1617 to 1753 in the chapel of the Angels of Mount St. Odile; today he can be seen in the chapel of the Cross.
Cantatorium Argentinian , (v. Alpais) p. 97 f; Albrecht, History von Hohenburg oder St Odilienberg, 1751, p. 50-56; J. Gyss, Odilienberg, 164 ff (1874); Pfister, Duché (diction.) (s. Odilia), 52 ff, p. 81-85; Clauss, Die Heiligen im Elsass, Dusseldorf, 1935, p. 1. 45-46; M. Barth, Die heilige Odilia, 1938, see index finger p. 321."
https://www.alsace-histoire.org/netdba/bereswinde-berswinda-en-all/
