Waiting for the trainwreck: What do you do when your LO refuses to trust family or doctors

I will try to keep this shortish. My younger cousin, 56, probably has early onset Alzheimer's and it's being exacerbated by self-medicating. She had an MRI in January and a PET scan in April that showed elevated amyloid in three of four lobes and borderline in the fourth. Since May she has been manic, paranoid, delusional, projecting her own mental symptoms onto her husband. She's also physically unwell, having had urine and bowel incontinence for months, and an ongoing yeast infection. She is an unreliable reporter of her own health and actions, and she has threatened herself and her husband at times.

Her husband and mother tried to have her involuntarily hospitalized to get help, but Cousin is a former social worker and was able to showtime enough to get the magistrate to dismiss the motion. Several days later, she actually took herself to an ER, where her mental symptoms were bad enough that they sent her to a mental hospital. She was there for two weeks, and admits that she played compliant and "better" in order to get released. So now she's home, no better, and we're all in the same nightmare we were before, only Cousin trusts her family and doctors even less than before.

So what can we do? If a person is unable to see that they are sick, how can you get them the treatment they need? Ironically, she said of her husband that "They [dementia patients] become paranoid and see the person who they love and who loves them the most, as the enemy," but this is actually a description of her right now. We all feel so helpless.