What primary evidence that this is a wife of Theodoric, King of the Franks?
See http://fmg.ac/Projects/MedLands/MEROVINGIANS.htm#ClovisIB
http://gw1.geneanet.org/henryknight?lang=no;p=eustere;n=de+los+visi... on overview doesn’t seem to offer any, but I may be missing it.
Cutting, pending primary sources.