Familia Enriquez del Castillo Confusion

Throughout the last few years I know several of us have been looking for the parents of Pedro Enriquez del Castillo (assumed to be son to Hernando and Maria de Cuellar)... and I too believed that but the following dispensa I found just yesterday says that Francisco Enriquez's mother is a "Petronila Gonzalez", sister to Christobal Gonzalez (who I have on my tree and have proven exists)... who is Petronila and why does it not say that "Ysabel" is Francisco's mom, Pedro's wife?

https://familysearch.org/ark:/61903/3:1:9392-6D9V-RX?i=542&wc=3J4M-HZ9%3A171935001%2C171974101%2C176159001%3Fcc%3D1874591&cc=1874591