I think you're wise not to bring up the car issue quite yet. Let her ease out of her anger/tantrum. She may even bring it up again and want to talk about it in a more adult way. If she doesn't bring it up and you still want to revisit the conversation so that you can get your points across then wait till she warms up a bit and can listen with adult ears and not her "child" ears and possibly understand that you're looking at the bigger picture.
Let me be the first to wish you a Happy Birthday, FY. Have fun on your bike ride and if your family and friends can't join you will still have a good time at the Drags. If I were there I'd join you for sure. Love drag racing!
Me:57H:62 M:34T:35 2S,2D (grown nlah) BD:09/2012 visits M ow EA/PA?:10/2012 H moves out 06/2013
"Do not let the behavior of others destroy your inner peace." -Dalai Lama