Well my parents bought me my first car, all of 30 years ago. Dontchajustluvabeetle
All of $350 it was and I loved that little car. But, I had to maintain it, fuel it, pay for rego and third party. And there was never to be more than 1 other person in the car with me at any time, until I got off my P plates (12 months) and I was 18. We can get our license at 17.
So if she can meet the costs, sure help out or buy one. You do know however that what she wants and what you can afford to buy or think is a good car are at opposite ends of the vehicular spectrum