She went undergrad to U of Miami (despite the thuggish image of the football program, it's a very expensive private school), then got a grad degree at one of the fancy NYC private schools; pretty sure it was NYU.
It's very easy to believe that much money was paid for her education at ultra-expensive private schools with little or no financial aid or scholarships (she's unlikely getting much of either, besides loans as "financial aid"). However, I'm with you that Lyin' Becky is probably just totaling up the costs of her degrees, not the actual debt burden she's responsible for because her family or Jackson's family helped.