she is either the same as her sister Mechtild (Mathilda) van Nassau (most likely lifespan: 1190 - 1247) but then only married to Heinrich de Rijke von Nassau, Graaf von Nassau in Medlands http://fmg.ac/Projects/MedLands/SAXON%20NOBILITY.htm#_Toc425950644 I find nothing about the spouse of Heinrich de Rijke von Nassau, Graaf von Nassau