Daniel, I have Juana Gertrudis's surname as MARTIN, not MARIN, as taken from her son Miguel's marriage. I don't have a copy so can't verify this.
Her surname may also be MARTINES?

!MARRIAGE: #299827, notes only
11 Apr 1750, Aguascalientes
En la capilla de la Hazienda del Sr. San Joseph de Guadalupe
en Los Muñoses, feligresia de esta Villa de Aguascalientes
Miguel DIAS DE SANDI,
español originario y vezino del Partido de Theocaltiche
hijo legitimo de Sebastian DIAS DE SANDI
y Juana Gertrudis MARTIN
con
Maria Catharina GONZALES DE HERMOSILLO, española
originaria y vecina de esta en los Tiscareños
hija legitima de Joseph GONZALES DE HERMOSILLO
y Josepha XIMENES, difunta
PADRINOS: Francisco TISCAREÑO y Rita PADILLA
9v

Hope this helps.
Gloria

---does anyone know anything on Sebasti?n D?az de Sandi's wife Juana Gertrudis Mar?n, they should have married ca. 1712. They had at least Sebasti?n Onofr? 1713 and Miguel 1717------