Devil's advocate here.
There has been a $#!+ - ton of pressure, anxiety, concern, worry, and just general weirdness going on for about 5 months now.
Maybe putting on the lapel card allows her to feel a little more "normal" for a bit, even though (obviously) no one at all, besides you, is going to see it. Embracing the familiar can be a coping mechanism. She remembers feeling good wearing her card at past assemblies, wearing it now helps her stay connected to "the way things were".
I think people are starting to figure out that things won't return to "normal" for years, probably many years.
Before we even get back to 50% normal we're all going to have to figure out some sort of coping mechanism.