Help with a brickwall ancestor please!

My great great grandmother María Flores (P3GC-DQC) is my brickwall ancestor. I think this is the most difficult line I am working on because I cannot find anything about her please if somebody could help me with her it will be really appreciated, she was born around 1882-1890, possibly in Juayúa, Sonsonate, El Salvador and passed away after 1939 (I know this because in my great grandparents marriage certificate it shows her as an alive person), she had a son named Manuel Inocente Flores (, my great grandfather born 1918- passed away 1948), and she possibly had a sister named María Luisa Flores born around the same time as her (1882-1890). I would really appreciate if somebody could help me on finding her parents, thanks!

FamilySearch profile URL: https://www.familysearch.org/tree/person/P3GC-DQC

(Sorry if this isnt the right tag for Brickwall Ancestors but the Brick Wall tag doesnt appear on my phone)