Are you concerned about the hallucinations or about the other symptoms? If the former, are you concerned about the hallucinations in themselves, or are you afraid that they are a sign of future problems?
Hallucinations are endemic. They just aren't a big deal.
I agree: as long as the "spirits" aren't telling her to harm herself or others, they're no big deal. You said she might have bipolar disorder - depression and mania are both pretty big deals, so maybe you could ask her to seek treatment for depression. There's less stigma about depression, so she might be more receptive.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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