She became abbess of Nivelles and Fosses after her husband was killed and Gerolf van Holland (c850-c895) took over as count of Holland. Gisela died childless.
However, Geni.com gives her at least two children, including Siegfried de Guînes (920-965) - https://www.geni.com/people/Siegfried-de-Gu%C3%AEnes/6000000043339050887 - who is a link in the shortest path from Charlemagne to Jacinda Ardern.
|#g2: Offspring of Lothair II of Lotharingia (c835-869) and Waldrada (c835-)|
|Gisela (865-908)||865,||908,||Godfrid (-885)|
|Bertha (c863-925)||863,||925,||Theobald d'Arles (-925) + Adalbert II di Tuscania (c875-915)|