I don’t know for sure, but she may have read Dante’s Divine Comedy and shared her knowledge with the other kids.
Overheard as the kids build things with their Lego sets:
Andrew (6): I think we need some more skeletons for hell and purgatory.
Lucy (8): Yes, we can use the black ones for hell.
Andrew: Ok, what about heaven? Can I put some of these guys with the white suits here?
Lucy: She has a scared face. She must be in hell because you’re not scared in purgatory.