Pedro Velasco Navarrete, Velasco de Haro, El Mozo

Hello to each and everyone,

I hope some very savvy members can help me in finding out who the mother of Pedro Velasco Navarrete married to Mariana de Aceves was.

The following is a very long Dispensa stating Andrea Rodríguez married to Juan de Aceves -
Pretenso's parents, Pretenso also named Juan de Aceves - was the sister of Cristóbal Becerra and also the sister of this Pedro Velasco Navarrete:

https://www.familysearch.org/ark:/61903/3:1:9392-6K9Y-SH

The file is full of testimonies confirming these relationships.

There is a Dispensa stating Pedro Velasco and Mencia de Velasco were siblings:

https://www.familysearch.org/ark:/61903/3:1:9392-XZ9Y-XR

So Pedro and Mencia were father-only siblings and their father was also named Pedro Velasco (In the long Dispensa Pedro is named "El Mozo", something similar to "Junior").

Therefore Andrea Rodríguez and Pedro Velasco were mother-only sibling.

Who is that woman who probably married both, Pedro Velasco (The father of Pedro and Mencia) and also married the father of Andrea Rodríguez and Cristóbal Becerra?

Any help is highly appreciate.

Rubén