Storyboard Pro 7 panels disappeared

I teach high school and one of my students called me over storyboard deleted her panels. she didn’t click anything, they just disappeared.
In the Thumbnail view, her panel says scene 3 panel 1. It looks to me that the panels should be there, but I don’t know where they went… Pleeeaaasseeee help!! She’s been working on this project for a couple of weeks!!