I will be facing a similar situation next summer. Out of curiosity/OCD I called a Rent-a-wreck franchise in St Michaels MD and spoke with a Kelly. She was very nice. Basically if Mom/Dad rents it and lists dtr as secondary driver AND dtr is on Mom/Dad's auto insurance, they will waive the underage driver fee. Runs about $500/month with no mileage fee. Miost of the cars they have in inventory are Taurus' that are 2-3 years old.
Here's a list of franchises closest to Norfolk...
http://rentawreck.findlocation.com/results.aspx
Might be worth the hassle factor/repair risk to just spend $1000-1250 and walk away at the end of summer. Even if you did buy a car you'll still have to spend $$$$ registering, licensin, insuring, etc. She doesn't have her own car at school?