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It seems that part of the problem might be that she is afraid of being judged crazy or the equivalent. Having someone talk to her about her being crazy (which is how she will probably perceive it) seems like it runs a risk of being counter-productive. I think so far I've only told you what you are implying or saying.
If I have that right, you might think about finding a story -- fictional or biographical -- written from the perspective of someone suffering from similar symptoms and who resolved it through treatment. If she identifies with the protagonist, it might create some willingness to listen to alternatives.