Fuente-Hernandez Connection:Mexico

Hi, I'm researching my family ancestors and I am stuck at my great-grandmother, Elvira Fuentes. She married Federico Hernandez and she died in 1941. She had a sister, Juana; and a brother, Herminio. I believe her parents were Nieves Mercado and Agapito Fuentes. If you have any information on her or any of the names listed, please contact me. Thank-you!