I was reading up.on something similar for those with Alzheimer’s here in Phoenix except it is not incurable and the cost is 7,100. My sister has early onset of dementia and I would do it in a heartbeat if insurance would cover even half of the cost.
If it as a real chance of working, I think it would be worth doing even if her insurance covered none of it. Maybe you and your entire family need to re-order your priorities. Is there any material thing in the world worth more than giving your sister’s mind back to her?