I'm a bit bemused, to be honest, by all the people here who insist that the GP and priest should be disagreeing fervently with flaccon and telling her she's deluded or mentally ill and needs treatment. Or even that the GP should be struck off for not so doing. Two points:
1. Weird behaviour and strange beliefs do not necessarily equal mental illness. It might well be that flaccon's right that her GP says psychiatry is inappropriate, and who knows, he might well be right too, according to proper diagnostics. There's a huge range of behaviour and belief that is not considered socially normal or even acceptable, that still isn't evidence of mental illness. If her beliefs are interfering with her life to a strongly detrimental extent the GP might take notice, but otherwise s/he might well be perfectly correct in not attributing flaccon's statements to mental illness. In fact, referring to psychiatry every time a patient comes in displaying beliefs or a worldview at variance with one's own is a great way to be in conflict with medical ethics.
2. EVEN IF the GP or the priest suspect mental illness when they see someone exhibiting delusions, the way to deal with this is not to challenge the delusions directly. All guidelines I am aware of say this. You see what happens in this thread, and myriad like it, when someone who has firm unusual, possibly deluded, beliefs is challenged head-on. The GP needs to establish a relationship with their patient, a 'therapeutic alliance', and to do this s/he has to tread the difficult line between encouraging delusion and not making the patient instantly walk out (and shop around for a more sympathetic doctor). They might even seem to encourage the delusions by finding a way to get the person help that makes sense to them and thus improves their health and wellbeing (for example, I can't help you with the spirits, but perhaps a nice priest might give you a blessing to make sure they can't harm you?). This is hard, and of course many patients come out of such a consultation thinking that the doctor agrees with them, but it has to be done.
As a final point, we only have flaccon's perception of what went on, and what her GP and priest are/were doing. If they are doing their jobs correctly she will feel that there's a door open for her to go and talk to them again, while they are gently pushing her in the direction of ensuring her beliefs don't negatively impact her life. But it's not their job - especially not the GP's - to 'prove' to her that spirits don't exist.