I found several baptisms in Santa Maria church in Los Remedios, Durango, some at la Capilla del Forminil, giving the birthplaces as Forminil. But I was not able to find anything on the Internet about Forminil.
Finally, I found the 7 Oct 1901 baptismal record of Maria Guadalupe Rodriguez that records her birthplace as "Pinos altos (Forminil)". You can see this text at the very bottom of the left-hand page in the image at
familysearch.org/ark:/61903/3:1:S3HT-DWYC-2C?cc=1554576&wc=3PZQ-FMW
Pinos Altos is a very remote mountain town -- so remote that even now Google Maps "could not calculate driving directions" from Los Remedios to Pinos Altos.