huh...that's both something very convenient to know for the future and rather troubling at the same time. if those fruits turn into seeds of the super growth trees when exposed to magic, then she can potentially make use of that to reliably mass produce paper...but it begs the question of what those things really are and how exactly they end up growing in the wild, as well as what side effects they might have on both the source of the magic that converts them (aka MC girl) and the world around if that's a magic effect rather than a natural one
I suppose best case mass producing paper actually heals her given her whole the sickness is caused by excessive magic in the first place setting...but it'd really take it out of the soil where they grow, those nutrients gotta come from somewhere