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Doctors are not supposed to stage dementia while people are delirious or have recently been ill, because it can take weeks (or even months) for people to recover to their best mental state after having delirium. Unfortunately, delirium can accelerate cognitive decline and some people with dementia never recover to the way they were before becoming ill.
In terms of your role as POA: usually the POA can act (or override) the older person once that older person is mentally incapacitated. The problem is that most POA documents are not designed to fit with an older person getting mentally worse, and then recovering after delirium.
In principle, now that your aunt has gotten better, her doctors should reassess her mental capacities, and confirm that she is still impaired enough for you to manage her affairs. I seriously doubt she'd still be considered "late-stage dementia"; in late-stage people can't walk, can barely talk, and barely recognize anyone. What you are describing now sounds more in the early-middle stage. But she will be prone to become very confused again when she is ill, and the nature of dementia is that people tend to slowly get worse over the years. So you should certainly be preparing to provide more help and oversight.
As for how to cope with her behavior and the situation...you will need information and support from others with experience and knowledge.
I would recommend posting more questions to the caregivers on this forum. Many people here have been through similar situations and you will get a lot of good advice.
Other resources to consider include Family Caregiver Alliance, the Alzheimer's Association, and your local Area Agency on Aging.
I'm sorry you have to go through this. Although she's not being appreciative, she's lucky to have you. And if you feel you can't do this or if you feel overwhelmed, ask the other family caregivers here for help. Good luck!
The early years you have good days and bad days, then you have bad days and worse days...