First off, I think people should cut Brandon a little slack.
When you’re writing anything like Cosmere-style fantasy (i.e. based of a wholly unfamiliar planet with a culture and language unconnected to ours) it’s inevitable that things like this will happen. There will always be language humor that only makes sense in Rosharan. There will always be Scadrians proverbs with no good parallel in any real language. I think we just have to accept that this tale is twice-translated (once from December’s language to The language of wherever the tale is being told, and again to English), and that the only way to represent an invented culture correctly would be to go even farther than Tolkien and not just invent but write in the language of that culture. Which would require all readers to read in that language. Which, frankly, is stupid.
Now to try to turn this bickering about Latin roots back to an arcanum discussion!
First off, I trust Design that time travel is impossible. Especially because a solid list of unproblematic rules for how time travel affects the plot is impossible.
Therefore, the first viewing probably happened within the spiritual realm and/or due to use of Fortune. Basically, she didn’t go back in time after her first life, but lived it as a vision that lasted sixty years to her, but a night’s sleep to everyone else.
It’s important to ask here whether Hoid has access to long-term fortune. If he does, then any Fortune viewings may be unreliable, especially over longer spans of time.
BIG QUESTIONS:
Where did she get all that fortune? Is she secretly very highly invested? Or (this is my preferred theory) did something external (like the demon, or another highly invested being) give it to her? It feels a bit like the start of Yumi, when
Alternatively, if the fortune was internal, how does she have it?
Is December connected to different important invested things than everyone else? It seems like the dominant investiture on demonworld is… well, the demon, along with its rivers of blood. Are there others we don’t know of? What is that demon guy, anyway?
December is clearly unusually invested and/or connected; she has the vision, and interacts specially with the river of blood, suggesting her connections and investiture are at least related to the demon.
I’ve noticed Brandon doesn’t love writing “Chosen Ones” who were born with the power they use to resolve the book’s conflict (the only one I can think of is Vin, and she still uses ingenuity and arcana to win where pure skill isn’t enough), which is why I’m willing to bet that December was externally invested/connected. And because of the special interactions with the blood river, I’m willing to bet that whatever invested her is at least connected to the demon.
It’s a flimsy theory, and I’m fully open to criticisms. I just want more people here theorizing.