If she just wants arcade racing, then get Burnout. It's a ton of fun both on and offline.
If she wants something a bit more realistic. Project Gotham Racing 3 is a great one.
So over the weekend my wife got me a 360 core system because she rocks that hard.
Her condition was that I get her a racing game for it. I have no idea what racing games are available for the 360, or if any of them are good.
Bendis Board I need your help. What racing games would you recommend?
For those curious the only game I have right now is Dead Rising, and I'm not on Xbox Live.
Facebook ID: Doug Hahner
Theres also a great new racing wheel out, if you're into that sort of thing.
Project Gotham Racing 3 (uber realistic)
Need For speed most wanted
Need for speed Carbon (just came out)
Burnout Revenge - Great Racing game - 360 or xbox version (its backwards compatible)
Burnout 5 (comes out in the next few months, supposed to be truely next Gen)
Racing wheel is wireless and supposedly pretty sweet, although it is like 100 or 150
burnout is a blast. I usually hate racing games and I loved it.
pocketbike racer from burger king, its like $4
If you have Xbox live (though I guess on the Core you wouldn't, but ANYWAYS), the new Test Drive Unlimited has gotten some killer reviews for its online mode.