How do you turn Mrs Hernandez into a proper noun?

You can't turn "Mrs. Hernandez" into a proper noun because it already is one!

Here's why:

* Proper nouns are names of specific people, places, or things.

* Mrs. Hernandez is a specific person's name, combining the title "Mrs." with the last name "Hernandez."

So, "Mrs. Hernandez" is already a proper noun and you don't need to change it.