She makes up stories and can't make up her mind about anything. Her doctor, who only sees her every 6 months, says she is competent. She tries to come on to every man she comes in to contact with, misses her medication, and falls often. The doctor says she is okay to live alone. She was stuck in between her front door and storm door, and a man who happened to be driving by rescued her and wanted to buy her home. They have a closing date tomorrow. She has changed her mind again. I am her POA. She has had two falls already that have landed her in the hospital and rehab.
Is the house being sold a fair market value or above? If she needs Medicaid in the next 5 years, it will be a problem if it's being sold for less than it's worth.
Is there a lawyer representing her at the closing?
The falls, hospitalization and rehab happened when?
From what you describe, your aunt is manifestly not able to enter into a legal contract at the moment. Doesn't mean she won't ever be, or that you won't be able to act for her, but it's out of the question that she signs a contract for a house sale at a time when she is unable to figure out how to open her own front door. A contract is not valid unless the parties to it know what they are doing, and she doesn't. Call the purchaser, if your aunt will allow you, explain that she is too unwell to proceed at the moment, apologize, and offer to contact him again once the situation is clearer.
If you asked your Aunt some big picture questions, you may get to what can actually help her going forward. Questions like Do you want to move? or Where to? or which assisted living? can be overwhelming & very hard to decide on.
Taking from the Atul Gawande book 'Being Moral' approach: what really matters to her? Having a safe place to live? With daily help? Activities she likes? Meals provided or ability to still make her own?
Whether selling now, to that buyer - I don't know... But time for a downsize may be due soon if not now. She is lucky to have family to assist her.