Where is Sondra Ann with a maiden name of Sondra A. Pratt? Married before with name of Sondra A. Borrego.

This is a global site. You will have to narrow it down some.

How do you know her and where did she last live that you know of?

Google the name, I did. Lots of people to choose from. You'll need to narrow it down a lot, and even then it will be like finding a needle in a haystack.

The best way to find her is to find mutual friends on Facebook and see if anyone knows where she is, or has her listed as a friend on their page.