Power of attorney My uncle has power of attorney of medical and financial over…

Power of attorney
My uncle has power of attorney of medical and financial over my grandmother. If he has taken her to a doctor to prove her imcompetent can she still make decisions on where she wants to live. She owns a home in Illinois and my uncle has put her in an assistant living facility. She is asking us if we can bring her home. Am not sure in Wisconsin if to prove her incompetent if it must go through courts.