It's possible that she's encountered someone like my friend, who is legally blind but has some vision at extremely short distances. She watches her daughter ice skate with a video camera, because while she can't see the child dozens of yards away, she can see the image on the camera screen.
(Or it's possible that she had a no-brain moment, of course)
My friend is the same way. But the closed captioning screen just displayed the text of what was being said on stage. It was definitely for someone who had trouble hearing, not seeing.
I took it as a no-brain moment. If I had to work in 90 degree weather, I'd have them a lot too. It was still amusing, though.