58-year old female with dementia on SS disability will need a place to live when her elderly parents pass. What will her options be?

Does she have a DPoA? This is the person who needs to figure this out. If your friend hasn't assign one, and she is beyond being legally able to, then someone (most likely a family member) can acquire guardianship of her through the courts and work with Social Services to see what her living arrangement options would be -- and there won't be many options with her being on SSDI. Whoever is her guardian would most likely be caring for her in their home and covering her living expenses until she needed LTC. Some state's Medicaid does pay for AL and MC, but not many. There is some help for in-home care through an Elder Waiver. Medicaid doesn't pay a high enough wage or for enough hours to make being a paid family caregiver a viable option.

If no family pursues guardianship then Social Services needs to be made aware that she is a vulnerable adult with no support. SS will eventually acquire guardianship of her. After that, I assume they will place her in a county facility of some type.

Has any respite care been successful so far? It is good to start planning as soon as possible, especially if you are the person everyone assumes she would stay with in an emergency.

I would suggest looking into whether Medicaid would cover her in a small group home.

Does she have access to a social worker? Does the senior center offer any care management assistance or referrals?

It might be worth considering setting her up in the new environment before the parents pass so they can assist in planning and pointing out what might make her more comfortable.

I would say that much of this depends upon the health and determination for her parents to continue this care as they themselves age. With there being no assets, and if none are left in trust to her when the parents die, she would be in a nursing home that accepts the governmental payment programs. If there is family as POA they can assist with attempts at placement;if not she would likely be a ward of the state.