Isabel Ortiz, wife of Pedro Gomez in Lagos de Moreno

Pedro Gomez, son of Diego Gomez, married Isabel Ortiz, daughter of Pedro de Anda, on 18 June 1613 at Lagos de Moreno, Jalisco. Pedro de Anda Altamirano was married to Beatriz Gonzalez de Castaneda. I am trying to find the genealogy for Isabel Ortiz,if any one has any ideas. What I have read so far is Pedro de Anda and Beatriz had three children: Esteban, Beatriz, and Juan. No Isabel turns up. Did Pedro de Anda have her out of wedlock with an Ortiz woman?