OK, so this is maybe not what you're looking for, but you've gotten a lot of great advice re: cutting costs. I'm going to offer another perspective.
I have an uncle (70s) who is developmentally disabled. For most of his life, he lived with my grandmother; shortly before she passed away, he transitioned to a group home. He works - his choice - but specifically in a developmentally-disabled workforce program that keeps his income super-low for SS/Disability/etc. I don't know this is apples-apples - your aunt sounds much more independent and high-functioning than my uncle, who has the cognitive functioning of ~10-year-old - but here are some things my family did:
1. My uncle cannot make responsible life choices. My mother has POA for his decisions, including medical, and my grandmother held POA before that for all of his adult life.
2. When my grandmother passed away and my mother took over, the learning curve on all the logistics and red tape surround his situation was HUGE. My mom essentially has a part-time job in managing doctors' appointments, social services, POA, etc - and she's worked in a field where this kind of hoop-jumping is common. My uncle has some health complications that add a layer of this that you don't have, but if you're the person who will be taking this over if/when your parents no longer can, I would ensure you're up to speed with them ASAP.
3. Our family has put most of his assets in a family trust that is specifically allocated for his care, that is managed by a family member; if you're looking at a financial POA this may be a consideration, though I'm not sure how the paid-off house would be impacted by this. The keeps his income low so he can access benefits, while ensuring there will be money to care for him as long as necessary; I believe the plan for when he passes is to donate leftover funds from the trust to the workforce development program / disability program that he's been a part of for decades, but I'm not the trustee so I'm not sure. It might be worth discussing your situation with a lawyer who specializes in family law and disability to ensure you're optimizing things while still ensure your aunt is cared for.
4. The family member who manages the trust talks with him about his discretionary spending and helps him shop, ensures his utilities and whatnot are paid, etc. There's a lot of stuff he doesn't "get" (he hates living in an apartment with "those people" but absolutely cannot live without someone available 24/7 - even if just for a wellness check) but talking about things and letting him grocery shop on his own has given him some independence.
5. Good call on the pausing credit due to scams. Another reason to consider a trust - real estate scams are not uncommon and prey on the elderly; if the house is your aunt's name and she's susceptible to these kinds of scams, you'll want to investigate a way to protect the house (and her) from that kind of predatory fraud.
Again, it sounds like my uncle has a lot more "family involvement" in his day-to-day life than your aunt does, but take from that what you will. And good luck - caregiving his hard, and that difficulty is compounded when the person you're caring for is dishonest and/or combative in that process.