KK and Hemmy are doing a great job ITT. No surprise, Worst Poster eastcat is still horrible. Just the worst.
Summary of stud advice in this thread:
1) You and your wife need to be open and honest with each other about all aspects of your finances. Savings accounts, retirement, student loans, car/truck payments, mortgage, etc. Get it all out there. If all of her money is going to student loans, that probably also means she's not adequately preparing for retirement, which will be another huge issue 10-20 years from now. If you're committed enough to this person to marry them, having a tough convo about finances shouldn't be that big of a deal.
2) Talk to a credit counselor (or whatever they're called) and probably a lawyer, too.
Other incorrect or dumb or non-true things that have been posted that need to be addressed:
-Student loan debt is one of the few things that can persist after a person files for bankruptcy.
-There is no "Obama Law Bailout" that says unpaid student loan debt is forgiven after 20 years. That is ridiculous, take it to The Pit (or Breitbart).
-Like your wife said, Income Based Repayment does not apply to private loans. It is also not available if you earn above a certain amount.
-I'm pretty sure that the "forgive your remaining loan balance after 10 years" does not apply to private loans, either. Can't confirm, though.
-Props to your wife for trying to dig herself out of this hole, and props to you for attempting to assist in this process.