My mom wants to drive but her mentality is of a child. How can I stop her?

My mom is in her 80's and she has not driven a car for years because I always took her everywhere. Her license has also been expired for years. She lives with me. She has been having mental issues. Her memory is bad. She repeats herself and questions over and over even when she gets an answer she doesn't remember getting the answer. She takes a walk and gets lost and confused. She can't remember if she ate. She won't take a shower and smells. Her cat pees in her bed so she is sleeping in cat pee and she says she can't smell it and says I am lying. The smell from her room is so bad it makes me sick. She gets out of breath just going up some stairs or sometime just getting up. She has glacoma and refuses to take her eye drops or go to the eye doctor because she can't see sometimes. Her vision is sometimes blurry. She can be violent at times. She wears the same clothes day after day, which makes it worst because they not only smell of body ordor but cat pee. The cat has a problem and needs to go for sanitary reasons to my mom but she refuses to get rid of her even when I told her I get her another one. She can't remember family or where she lives. She thinks her siblings that have died over 50 years ago are alive or she makes up new one that never existed. She either talks to herself or talks to her cat which I believe she thinks she is a person. She forgets where she puts things and either accuses my children or I of taking it. She collects grocery bags and paper and other odd things. She acts like a 2 year old. She refuses to go to the doctors. What I have been reading I believe she may have dementia or alzheimer. She has almost all symptoms. Now she wants to renew her driver's license. Being her caregiver for years I been seeing her getting worst. I know if she got to drive she or someone else is going to get hurt. I don't know what to do. She is very stuburn. This is not my mother. Any help would be appreciated.
Thank you