The reason she isn't able to get a crazy car loan is because there's no government program giving anyone unlimited loans, no questions asked. Private lenders understand not all degrees are made equal, so if you go to LendingClub or similar and ask for a student loan for a top tier law school, they'll gladly give you a loan and charge you less than the government. Bonus is that you can dismiss the debt in bankruptcy.
The simplest answer would just be to severely restrict or eliminate federal loans for school and let private lenders fill in the gaps.