If you have $50,000 in credit card debt, for example, they don't factor that in your financial aid and say, "Gee, you're broke, here, have some more money!"
If you're really floundering in credit card debt, pay it off with your student loans. I guarantee the interest rate on the student loans is lower, and there are many more ways to defer repayment. You're not going to get that kind of forgiving service from your credit card.
Better yet, just don't spend the money you don't goddamn have and rack up credit card debt.