Yeah, she existed in the Golden Age. She was first in the interview at the beginning of the movie with Mr. Incredible and Frozone. A few minutes later, she and Mr. Incredible argue over taking down a bad guy. Then she does that cool move where she uses her elastic powers to maneuver through his body. And then, that night, they get married.

And I appreciate you looking for the pictures, but I can't confirm or deny if that's what I'm looking for because I can't see either of them.

EDIT: Thanks, Chaltab, but I think that might be DC's Elastigirl. Pixar got into a bit of trouble using the name because it was already an existing superhero, so all outside merchandising referred to her as Mrs. Incredible.