So it is a joint car. I would consider this option if you think it's financially viable. Can you reasonably get a decent car with half of the proceeds?
Just thinking that it may be good for her to see what it means to be D. She will have to be responsible to get a driver's license, get a car, pay for her own insurance and gas and if she can't, she has to find another way to get to work in the morning.
If it's unreasonable then don't agree just to give in.
If you love somebody, set them free. http://tinyurl.com/2empx2g