How to trace a gmail address from a yahoo account

Hello everyone.

This is my first post. I met this woman at an online dating site, but I'm feeling a little suspicious about her because I suspect she may not be who she claims to be. The red flag came to my attention when we were about to exchange photos of ourselves, so I gave her my yahoo email address and then she gave me her yahoo email address. But moments later, she told me to send my photos to her gmail address. Naturally, I was puzzled by this, but I didn't bother to ask her why. Anyway, I would like to trace her email address back to it's source. She claims she resides in Bronx, N.Y. but I want to be sure about that.

Is there a way for me to trace her gmail address using my yahoo account?