My first instinct is to tell you that those student loans are a fairly low rate of interest and can be paid off bit by bit.
However if you have money in excess of $20k then it sounds like you need to investigate how to invest a portion of that, to gain further interest. And then portion out the rest in a payment plan for the student loans that works best for her. These loans will stick around for years to come so you don't want them looming at a vulnerable time. If you can knock them down substantially, that is great, but don't leave her with ZERO savings and some amount still owed on the loan!
Have her use her current car as long as she can maintain it.
She will drive "stanley" til he drops!
I wouldn't start on the credit route yet unless she is already good at budgeting and is used to logging into her bank and dealing with payments on a regular basis. If you've already been supporting her through that, then awesome! But don't start her on all the rewards type cards and such yet if there is any chance she might go on a spend-spree at Ebay or something.
Sounds like she is off to a good start!