de la Rosa Sandoval - Fresnillo, Zacatecas-

I’m searching my father’s line to Zacatecas, the name of my great grandmother was Ines de la Rosa Sandoval, all I know is that she was born in Fresnillo, Zacatecas around 1887-1889 (on the birth record of my grandfather said she was 36 by the time he was born -1925-)
Her parents were Jose de la Rosa and Narcisa Sandoval, or so it said the birth record of my grandfather.

I've searched the IGI and all I found was a marriage record of Juan de la Rosa + Narcisa Acosta, that it could be them since there are always mistakes like that. [28/10/1872 at Fresnillo de Gonzalez Echeverria, Zacatecas M600825 0439842 Dates 1866-1885]

Do you have any ideas on how should I proceed with my searching? I'm not in Mexico wich make things difficult, therefore any idea will be welcomed!

Thank you in advance!

Monica

PD I have a Gedcom file of my searching, but so far its more orientated to the north of Mexico, anyways I'll like to share it, how do i do it?