She is living in an assisted living facility? If so, you need to talk to the social service worker there. Do they accept Medicaid to pay her rent? Do they have a Medicaid opening available? In my experience, most ALs accept Medicaid but do not have any Medicaid openings, which means unless someone else is willing to pay the rent, the person needs to move out.
If your aunt is able to live with limited assistance, she may be able to move into subsidized housing. The rent is usually only 1/3 of the person's income. Utilities are usually pretty low, too.
If she needs assistance with her personal care and cannot live alone safely, she may need to go to a nursing home. Just like with assisted living, you would need to find a nursing home that accepts Medicaid, and has an opening for a Medicaid-paying patient.
For more assistance, you can call your aunt's local area agency on aging. You can find the number here:
Eldercare.gov You might also want to ask about programs to help lower her prescription medication costs.
Best of luck.