It went pretty well!! She was her 'charming' self but I decided I was going to enforce our rules from the get-go. I did have to reprimand her a few times (nicely) and once when she was having a 'princess' moment I just changed the subject entirely!

She then forgot what she was 'princess-ing' about!
When we got out of the van, I asked her if she needed help down. She said in a really snotty way, "NO!"

and I said, "You mean, 'no thank you'?" She was silent. I then said, "No thank you?" and then again "NO thank you?!" She finally said it. I then said "Thank you for using your good manners!"
The ride wasn't bad at all. I found a better way, and the school wasn't a hassle to get into or out of. The administator told me I needed to walk her back and I told her what the mom told me, and she said, "I guess that would be me"

And I said, "I guess so!".
We'll see how it goes tomorrow. And then next week I'll ask for the $ since I'll be driving her on Tuesdays, Wednesdays and Thursdays. Dh told me he definitely agrees I should say something about it. A favor is a favor is a favor, but as we are 'friendly' but not real "friends" and I can't forsee us being them in the future, I think paying for a job well done should be expected.