Its a tricky one isn't it ? I don't have any experience with deep seated beliefs in the spiritual world, but do respect that many people have a very deep connection with their spirituality. In most cases I would expect that this would be a separate issue to psychosis and may not be helped by anti - psychotic medication.
Your friend may be on quite high doses of medication at the moment which would exacerbate her slow thought process and awkward silences, but these medications tend to have these effects to a certain degree in many patients even at low doses.
It is incredibly sad to see vibrant, energetic, creative people, dulled down to barely functioning individuals, but the alternative can be much more frightening. Unfortunately if your friend is experiencing genuine mental health problems as opposed to a " spiritual awakening " there may not be any easy, quick answers. It can be a very long and difficult road to getting their lives back to some sense of normality. With a lot of professional help, many people learn to manage their conditions and go on to live positive, worthwhile lives.
I should add that I don't have any medical training in this area and my comments are simply those of one who has already had similar experiences to you and spoken to many others in similar situations. Our family has had a number of years of very close contact with professionals in the mental health field and confronted a range of experiences in the way patients are managed.
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