A POA is for finances, a health care proxy is what you mean. You can get the document from the hospital and she can sign it at home if that’s what she wants. However she has a right to make her own medical decisions..Try to keep her hydrated..
“A POA is for finances, a health care proxy is what you mean.”
That’s true in Massachusetts, where I have elderly parents, which is how I know. It’s false in California, where I deal with powers of attorney for healthcare (Probate Code Section 4701) quite often. The terminology varies from state to state.