I'm not going to let my wife use my car after she got a parking ticket
Why would you not let her use the car?
She's too careless with it!
If she's that much of a danger to herself and others, than maybe you're right. In that case, I think it's good of you to tell her it's not okay to use your car. Hopefully she'll get better!
This is what happens when you don't listen to me. She's always being punished for this reason!
It is your car though. If you do not feel comfortable with the way that she treats your car, it is okay to tell her no about using it.