My wife's grandmother lives in Alabama. She was basically her mom growing up. My wife’s mom is a mental case and has POA. Advice?

My wife’s mom has power of attorney over health and financial. But she has said multiple times she only is because of her social security and getting a free ride. My wife and I were wanting to figure out if we can somehow override the POA and have her live with us. Grandma is of sane mind and can still make decisions on her own just needs help with meds and bills. And advice would be of great help!