Ehrenfried (Ezzo) II. Count Palatine in the Zülpichgau, Keldachgau & Bonngau - Mother

Is there documentation for the mother and Amaltrude von Sillichgau (Bonngau) (von Avalgau) connected to Ehrenfried II?

Asking because I can't find any mention of her in the profile notes or on the links in his profile notes, none of which list the name of his mother.

Thanks in advance for any additional information / clarification.