Fresh Eyes and Input on the Ancestry of Melchora de Reyes (Moscoso Sandoval Delgadillo)

I need help figuring out a mystery that has been bothering me for quite some time. Im working on the Delgadillo's of mid - late 1600's Nochistlan. All events below occur in Nochistlan.

I descend from Melchora de los Reyes Moscoso y Sandoval Delgadillo (MSD) married to Pedro de Placencia 14 Jan 1668. Based on Hiltons book #893 we learn that Diego Sandoval and Maria Delgadillo are Melchora's parents. We also learn that Maria Delgadillo has a brother, Luis Delgadillo where both are children of Luis Delgadillo, el Viejo, and another Melchora de los Reyes.

Now knowing her parents we find the record of Melchora MSD's baptism on 1 December 1646 explicitly stating the correct parents. Using family search we find Pedro and Melchora had children in at least 1668, 1672, 1675, 1687. There are at least 4 other children when the exact births are not know.

Now looking at Hilton's #966 we find a Catalina Vargas marrying Salvador Gutierrez. Catalinas parents are Nicolas Vargas and Melchora Delgadillo. We learn that Melchora's mother is Maria Delgadillo. We also learn Maria has a brother named Luis Delgadillo where both are children of Luis Delgadillo, el Viejo.

Now looking up Melchora Delgadillo and Nicolas Vargas' marriage we see it probably occurred 16 April 1654 (on family search Nicolas' last name is unknown and I cannot locate the record in the collection film 226724; Melchoras mothers name is Maria Delgadillo). This would make Melchora 8 years old at marriage (?) Nicolas and Melchora has children at least in 1659, 1661, 1677, 1680, and 1683.

Now I dont know whats going on here. Is it just amazing coincidence that the Melchoras have family members of the same names? Are the Melchoras the same person? Did Melchora have two husbands? Both couples were having kids around the same time. Im stumped.