This will take work on your part, and therapy for your family.
Currently, you are unable to make necessary decisions
For example, live with it, have her committed, make her live on her own if she thinks there is nothing wrong with her.
Any of these might change her situation.
Or, even starting therapy yourselves and inviting her until she comes with you, and might listen to the therapist.
Those are what I see as the options.
These are recommendations we make daily in medicine.
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