The year could also be verified with the uniform. I don't remember this color. In the 80's is was that shit brown color polyester.
1976, I could see some blue since it was the
bi-centennial.
She just turned 60, so she would have been 12 in 1976… so that's a nope.
It is 1976 -1979
so at max she would have been 15
https://www.mashed.com/1316175/mcdonalds-uniforms-changed-over-years/