...You know, I sympathize with the desire for a rational explanation, but something is up with Geniuses. Keep in mind, Yenyna hasn't just had her creepy crow-visions, she hasn't just got some sort of absurd natural talent for strategy, she also somehow went from complete civilian to taking on the frigging Prince of Egypt who had trained since he could walk and probably had half again her upper body strength in hand-to-hand combat. That's not in the normal range of 'isavant'.
Then we have a lady who takes half-assed observations of comets and such from our half-assed star charts given we don't actually know astronomy, combined with historical accounts, and somehow predicts a meteor impact. Complete with a political strategy to take advantage of that. I think the notion that this woman somehow accomplished what modern nations had trouble with twenty years ago and came up with it just in time to warn us and a coherent strategy was established to take advantage of this? That really, really, really stretches the bounds of pure serendipity or 'savant' again.
There's a big difference between 'peak human' as described in comic books and 'peak human' in reality. Trying to neatly file this sort of stuff under 'peak human' is starting to look as silly as Captain America's 'peak human'. Again, I sympathize with the urge to do that lest we go astray, but at this point we really should be looking at Geniuses closely. Something's up.