What's the best placement for my 56 yr old mother who has early onset dementia and has ran out of money for her assisted living?

Agree with sp196902. She needs to become a ward of the State. You will not be able to afford to quit your job and take care of her 24/7. Please don't consider that, it will cause financial ruin to you. You need to get help from a state social worker, the SW will know the route to take to keep mom safe. It very possibly will be a nursing home, but trust me, not all nursing homes are bad, and your mother will be kept safe. As someone else said, memory care may be the best option, but memory care facilities are usually private pay. You need to get a state social worker to take control, it is possible in your state that a memory care facility will take state Medicaid patients.

SSI, do you mean Social Security or Supplemental income?

I would file for Medicaid to care for her in a Long-term care facility. If Mom is under the income and assets cap it should be pretty cut and dry. I would sit down with a Medicaid caseworker. One problem you have is Mom is under 65.

Not sure what the problem is from 9 yrs ago? Was Mom disabled in some way back then? Because if by SSI you mean Social Security she couldn't have gotten that, it would be Social Security disability she would have gotten. If it was Disability she was going for 9 yrs ago, you need to find a Lawyer who does SSD claims. He cannot ask for money at this point. He gets paid by SS from the retro money you Mom will receive. He may be able to get SSD now.

If Mom gets SSD now, if she can get Medicaid, I don't think she is allow the Supplemental too. Two government monies.

She will more than likely do best in a memory care facility, as early onset Alzheimer's can go on for 20+ years, and I know that you're not equipped to care for her that long.
A man from my caregivers support group just lost his wife this past July and she had early onset Alzheimer's and she was in year 21 of having it. He had cared for her at home except for the last 7 1/2 years that she was in a memory care facility.
She also went to an adult daycare center 5 days a week and 8 hours a day before being placed.
It's a tough long road that you and your young mother are on. I would apply for Medicaid for her and find the best memory care in your area that accepts Medicaid.
I wish you both well.

She might have to become a ward of the state to get help since she has no money. I can't believe that because she missed a hearing in 2009 that now over 10 years later they won't give her SSI. Have you asked a lawyer about this?

Please don't move your mother into your home or quit your job to take care of her. I know it sounds harsh but destroying your life and income potential to delay the inevitability of putting mom in a facility is not worth it.

Dementia sucks but it's even worse when someone gets it as young as your mother. There is a movie about that with Julianne Moore called Still Alice.

Best placement? Home

I am afraid that a nursing home will be your option on government assistance, and having run out of private funds your Mom now requires placement with help of the government assistance, whatever kind she can get. I would caution family to save their own money for their own aging care needs, as this case proves how quickly said money will run out.

I am so sorry. This is tragically young for this to happen and it is incredibly sad. I wish you all the best of luck.