Presumably she talks about these fears of evil spirits at church ? Can't your daughter try to speak with someone at that church, and ask them to help the woman ? Has she seen a sangoma or other traditional healer ? If their assistance doesn't help, its very possible she is suffering from a psychotic illness with delusions coloured by her cultural and chuirch beliefs, but outside of those norms. That is where it is worth while at the same time, to try to persuade her to see a doctor ( even better, a shrink ) at a local clinic or hospital ) for proper assessment, as if as is quite likely, this is a delusional psychotic disorder, medication could make a major difference in helping her to return to reality and to feel more comfortable and unafraid.
Its also possible that chemicals in the smelly tea could be making her more disturbed and confused, rather than less so. But at least it opens the possibility that she might be persuaded to try other medicines of a more orthodox sort, which could be more helpful
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