POA does nothing in terms of medical care. You would need to get a guardian appointment. That has to come through the courts. Then you have to “section” her. I had to do that with an aunt.
Once she is in a clinical setting you will have more say with a Healthcare Proxy.
Without that legal paperwork, you are SOL.
I am getting the legal paperwork in order but truthfully it scares the heck out of me. She still can walk small distances and as a nurse I have given meds for years, she takes them without difficulty but who knows what is up ahead. I take it day by day and thank goodness I do have some experience with this sort of thing but to be beholden to the court I find frightening. I do not know all that that entails and I do not want to have a ‘boss’ and have to do stuff for someone else. But I see no choice.