Reinmed von Metz - No source for her parentage

I cannot find a source which confirms or suggests that Reinmed von Metz is the Daughter of Count Richard von Metz, Graf von Metz, Billung Im Padergau other than other sourceless family trees. I can however find a scource for the other three children http://fmg.ac/Projects/MedLands/LOTHARINGIAN%20%28UPPER%29%20NOBILI.... Does anyone have a source that suggest that her father is indeed Count Richard von Metz, Graf von Metz, Billung Im Padergau?