Enriqueta Medina Alva (Avila) (Alba)

I have been unable to find my grandmother's, Enriqueta Medina Alva, birth record, although her marriage and death record shows she was born on April 24, 1880, in Jerez, Zacatecas. Some records show her grandmother as Refugio Avila and as Refugio Alba. Her father, Faustino, died right before my grandmother's birth. Have unable to find any of his records, also. I estimate that Faustino was born about 1860 in the Jerez area. Help!! Raul Cristerna Luna