Jan are you your mother's attorney in fact? She can make that happen, even temporarily for now, with a notarized form... and then you will have the authority to call the police on your own for her.
Why not call the police dept now and ask them how to handle the impending situation? You know how they love to feel important and knowledgeable
And, if you do have to call the police, what of it? Don't get personally, emotionally involved, just pick up the phone and call. Dust off your hands and go on.