put your feet down

Driving on long trips (more than 5 minutes) with Makenzie is well, interesting. She likes to talk and she loves to put her feet up. I have to tell her at least 30 times, on a good day... "put your feet down." I think I was on time number 362 for the day, when Makenzie asked me "Why do I have to put my feet down?" I took my time in deciding how to respond, knowing that however I respond she will give it 3 minutes before she puts them right back up there. Several things ran through my my mind, from the "because I said so, I am the adult" to "It's unsafe" to "you are ruining my seats". Ruining my seats is not exactly believable, I drive a car that's 12 years old, the seats are beyond help.
I finally decided on "You know Makenzie I would prefer if you didn't put your feet on the seats because its unsafe, if we get in an accident you could be injured or killed"
Her response- "that wouldn't be so bad"
Me- "yes it would, if you something happened to you I would be very sad and so would your mom"
And would you believe the girl gives me an answer I was not expecting, nor asking for, big surprise in Makenzie world.
"Honestly, Aunt Mandy it wouldn't be that bad... I can just hang out with God until Grammy gets up there to heaven. The Man's been taking care of me since I got here, you think he's not gonna help me get friends up there until everyone else comes?"

Exactly how do you respond? You don't.

Time between conversation and the next feet on seat incident... how about she never put them down.