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.