The only thing I would point out is that while Ursus are very spiritual creatures, having them accurately read the future/present would be having a magical skill, which is something I don't feel would fit in with this world being completely inexperienced when it comes to harnessing magic.
However, you could do it on the same line as Native Americans, who can go on spiritual journeys without any need for magic - relying instead on natural remedies, meditation and so forth. It doesn't allow them to see the future (or present but far away occurances), but it certainly would allow them to open their minds and give them great insight.
In fact, perhaps your priestess could be leading the way towards making breakthroughs in harnessing magic in the future, perhaps through such natural remedies she eventually opens her mind to the magical realm with the guidance of an Outworlder experienced in magic?
EDIT: Of course on re-reading your entry this may be exactly what you meant.
