My guess is she found it hard to breath and pulled the mask down. Her face looks a little reddish compared to the rest of her.
She’s at the point of unloading a good amount of groceries after pushing a heavy basket around the store. I had the same problem last time I went with my bandanna mask with coffee filter inside the layers.
By the time I got done bagging my groceries, bringing them to the car and unloading them into the car, I had to get in, turn the air on, take the mask off and breathe for about 10 minutes just to catch up.
Wheres the cashiers mask and plexiglass divider?