She is married to Gilles de Montaigu.
They got married
LAURETTE (-before 1184). The Genealogica ex Stirpe Sancti Arnulfi names "Loreta filia comitis de Los" as wife of "Theobaldus comes de Monceons"[745]. The Chronicle of Alberic de Trois-Fontaines names "Loretam filiam comitis Ludovici, sororem comitis Geraudi Losensis dyocesis Leodiensis" as first wife of "comes Barri Theobaldus"[746]. The primary source which confirms her first marriage has not yet been identified. Heiress of Longwy. m firstly (divorced 1174) GILLES Comte de Duras, de Montaigu et de Clermont, son of GODEFROI Comte de Montaigu, de Clermont et de Duras & his wife Juliane de Duras (-before 1193). m secondly ([1176]) as his first wife, THIBAUT de Bar Seigneur de Briey, Steinay and Longwy, son of RENAUD II Comte de Bar & his wife Agnes de Blois ([1160]-12/13 Feb 1214, bur Saint-Mihiel). He succeeded his brother in 1190 as THIBAUT I Comte de Bar.
Bronnen:
[745] Genealogica ex Stirpe Sancti Arnulfi descendentium Mettensis 3, MGH SS XXV, p. 383.
[746] Chronica Albrici Monachi Trium Fontium 1214, MGH SS XXIII, p. 899.
http://fmg.ac/Projects/MedLands/LOTHARINGIAN%20(LOWER)%20NOBILITY.htm#LauretteLoozdiedbefore1184