My mom got lost for 6 hours driving. She has the early stage of dementia. How to take her car away?

People would drive forever if they could. Who is to determine if a person is still capable of driving if they pass the competency test? If they have their marbles who says they can’t drive? I only say this because my mother is 96 and you bet she would still be driving if her car hadn’t died 4 years ago. She had money to buy another car. Thank goodness she isn’t driving and things happened the way they did. I would have the doctor say that someone can’t drive. Take the car away if you know they can’t drive. I meant to say my mom did NOT have any money to buy another car. Since your mother DOES have dementia it is imperative you stop her from driving. Get her doctor involved. Take the car away.