Victimhood is power, d00d.

But, anyway, the medical establishment has spent well over a century, now, downplaying people hearing voices, such that they are to believe they are all either their own thoughts, or random hallucinations (except that they never tell anyone to do anything that ends well for them). If you take a dive into it, that is just evidence-free handwaving, to keep up the materialistic facade. There's good circumstantial evidence that most people hearing voices in their minds are actually hearing voices in their minds, of some thing, or things, that is not them, and has cause to use them. Likely, everyone gets this to some degree, just not so bad as those people.

Was it demons, was it the government, or was it just simply a psychotic breakdown.

Could it be two of the above, or even all three? The demons help lead this weak woman to a psychotic breakdown, and use the latest evil trends, supported by the government propaganda, to help do it, because even they want maximum results from minimum effort.