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Then you have to persuade her that this is real and correct.

Only then can you reward her with some sounds, and get her interest in improving her life.

Personally I give little chance of success

A more important action is protecting others from her depressingly negative influence.  They can learn by example, and so you need a number of people who will counter  her negative influence.  I find this difficult, and rely  rather too much on 'I don't understand what you are saying', but at least I am putting up some opposition.

Left as she is, I personnally would consider her an evil influence on the community.  She may well claim the same about me, particularly as I bet she is a devout christian.

M