Tell her not to sweat it. If she's breathing and practices basic firearms safety, she'll likely pass with flying colors. It's pretty darn easy. Plus, she doesn't have to score 100%.
Another range trip could never hurt, but there was more than one person in my class who'd never stepped foot on a range, and they passed with ease.
Most of the shots will be fired from within 21 feet or so. Many of which will be far closer. Tell her to take her time and concentrate on her shooting, not how others are doing. She doesn't have to rush through it.
Everything is very basic. There will be no tacticool cartwheel shots, or shooting from behind trash dumpsters. Simply stand still while shooting at a stationary target that's nearly the size of an average person.
When it's over, she'll laugh at herself for stressing over it so much.
Best of luck to both of you. Keep us posted.