Here is YOUR Maria Ana De Casas marriage record:

JOSE FELIPE CARRILLO
Male
Marriages: 
Spouse:  MARIA ANA DE CASAS
Marriage:  18 JAN 1804   San Luis, Colotlan, Jalisco, Mexico
Messages: 
Extracted marriage record for locality listed in the record. The 
source records are usually arranged chronologically by the marriage 
date.  
Source Information: 
Batch No.:  Dates:  Source Call No.:
M604653  1790 - 1819  0443783   

I don't think we are talking about the same Maria Ana Casas.  I can't 
imagine her having children in the 1750's and then remarrying in 1804.

- Angie