There are multiple people named “Elsa Mendoza” mentioned online, and they are not all the same person, so the answer depends on which Elsa Mendoza you mean.

If you mean Fernando Mendoza’s mother (college football QB)

Public profiles and features on Indiana Hoosiers quarterback Fernando Mendoza describe his immediate family as his parents, Elsa and Fernando Sr., and their three sons: Fernando, Alberto, and Max.

These sources only mention Elsa in the role of mother to her sons and do not mention any sisters or other siblings of hers, so there is no reliable confirmation that this Elsa Mendoza has a sister.

If you mean the religious vocation story

A different public biography describes an Elsa Mendoza who is the youngest of five children, born in Monterrey, Mexico.

Being the youngest of five implies that this Elsa very likely has multiple older siblings, which could include one or more sisters, but the short bio does not state their genders or names, so it cannot be said with certainty that she has a sister.

Why the answer is uncertain

  • Several unrelated people named Elsa or Elsa Mendoza show up in sports, religious communities, forums, and TV discussions, and sources do not always use middle names or other identifiers.
  • Because of that name overlap and the lack of precise, public family details about most of them, there is no definitive, widely verified statement that “Elsa Mendoza has a sister” for any specific, clearly identified Elsa.

In other words:

  • One documented Elsa is the youngest of five children (very likely siblings, possibly including sisters, but not clearly stated).
  • For the more widely discussed Elsa who is Fernando’s mother, no trustworthy source currently confirms whether she has a sister.

Information gathered from public forums or data available on the internet and portrayed here.