Anyone know how to deal with someone so resistant to any help or advise?

Sometimes even the Geriatric Doctor can not help. I took my narcissistic pre dementia mother a couple of weeks ago. He wants to take her license away (and we are all grateful for that!) The problem is once she heard that, she decided he was a quack and will not do a single thing he wants her to do...Changed her meds, she says I looked it up and it doesn't exist, he gave me a made up medication, driving class? She told him yes, she got home and said screw him it is too expensive, I will drive until I die. Same story with recommended exercise classes, too expensive...Except yesterday she went to the mall to go clothes shopping (telling me of course her new meds make her so dizzy she can not walk and had to sit every 5 feet), that she has money for. He set up a CAT san, she said she won't go, she had one, she just can not remember when HAHA And on and on, so I will call her regular doctor and tell him he needs to follow up, and perhaps I should call the transportation ministry? I do not know how to get her car away from her without getting killed by her, so anyone know how to deal with someone so resistant to any help or advise...and remember she is a full blown narcissist, so she wants us to butt out, BUT be at her beck and call at all times. ANd when you show up, its a fight and I get called a myriad of names.... This is gonna be a long hard journey...