I find it curious that this post is being down voted. While the weight issue doesn’t address the new age or spiritual stuff, it does impact self esteem (which may or may not be intermingled with some of the more far out things she’s confessed to experiencing). Besides, being healthy is just a generally good thing.
I feel that tailoring your approach to be more new age-y as Hollander suggested would be more effective—as in the wraith example above, it’s within the rules she seems to operate by. However, I’m not sure how you would broach the subject without causing more problems. You kind of need her to want this for herself before you can do anything.
In any case, good luck Crono.
I don’t believe that for a second though. Everything we know is likely as wrong a phlogiston, though our predictions are surely getting more accuate. “We cannot know” is just hitting the worship button—which I’m fine with if you are talking about “what’s the meaning of life.” However, this is the mechanics of the universe, so we should probably stay away from that particular button in this case. Don’t forget a singularity is Not an anomaly in reality itself, it is an anomaly in our models’ ability to predict was will happen in reality. So time makes no sense in a singularity—that means the model for time will need to be changed. That’s not the same as there is no answer.