The plate fabrics look like 30s materials.
It does not mean it was made in the 30s ......... I remember my Mom still having that type of fabric around our home in the 50s and making things with it. And besides, we can buy 30s repros today. Will that confuse people in the future, or what? :)
What makes you think it was made in the 60s? Her age? Something she told you?