(((((Mattie))))))) I'm thinking of you. Now it's time to live and do the things you've always wanted to do.
As far as the car goes, here are my thoughts. Let him go ahead and get the car now. You never know, he may change his mind later and then you will get burdened with a car payment by yourself. Isn't she a senior? She will definitely need a car when she graduates. Perhaps both of you could both list some rules for the car usage. Draw up like a contract of sorts and both sign it. These rules could include discipline as well as grades.
I know how you feel as far as daughter goes. It seems like I'm the one who has to be the one that enforces all the rules, stay up at night to make sure she gets home safely, make sure she is keeping her grades up, etc... But I am so thankful to have DD16 with me, all of the rest seems like small stuff. I know you feel the same way.
Life's challenges are not supposed to paralyze you, they're supposed to help you discover who you are. -- Bernice Johnson Reagon