Stone of healing powers: I think what you need to do here is not necessarily suggesting empirical testing, but more along the lines of explaining the map-terrain problem: that a medicine merely changes the body, and whether we call that change healing or harming is a map thing, a thing in the human mind, an interpretation. Nothing has healing properties as such, not even official medical treatments, they just have body-changing properties which we interpret as beneficial i.e. healing. Healing is a mental thing, and it is reducible to causal chains of changing bodies out in the terrain plus the value judgements we associate with them here in the map. Thus ascribing generic healing properties to a stone is the category mistake of putting a mental, map property to a piece of terrain. You can explain it this way: a natural disaster does not harm people and is not evil, it merely changes things around and we interpret this change as harmful and bad. Same for healing.
Anyway, a more pragmatic idea. Get her on Zen. This is vaguely in the same cultural category as New Age and similar things, she will probably not dislike the idea, but it is an excellent rationality tool as it creates precisely this kind of distance in the mind, to see the map-terrain problem, to see the difference between reality and intepretations etc. Make her read Alan Watts. He was a hippie god. He was no the best Zen teacher around, but culturally compatible with New Age stuff and then she can go to a proper Zen meditation center.
Osho is another idea, he is a huge mystic and and easy for purely-rational people to dislike, but again he is that kind of mystic who is good at explaining map-terrain problems and this really helps in such cases.
Nothing has healing properties as such, not even official medical treatments, they just have body-changing properties which we interpret as beneficial i.e. healing.
That's a debate of semantics. If the store would empirically create health benefits than it doesn't matter much whether the label of "healing powers" is semantically correct.
He was no the best Zen teacher around, but culturally compatible with New Age stuff and then she can go to a proper Zen meditation center.
I would be vary of bringing a person who sees spirits to spend more time meditating. I wouldn't do anything that encourages the girl to detach from reality.
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