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One small note. Hard as it is to believe, the problem may not be that your mother doesn't want to get better, but that she doesn't realize she's sick.
It's common for schizophrenics to have poor insight into their illness. Some doctors are researching how this might be connected to a neurological condition called anosognosia, which is seen in people with certain kinds of brain damage.
For more information, I suggest Xavier Amador's
I Am Not Sick, I Don't Need Help
. Dr. Amador is a psychologist whose brother suffers from schizophrenia.