When you're married, the way you file your taxes and the plan you pick affect your payments. If you file jointly, any plan you pick will take into account both of your incomes. If you pick REPAYE, then your loan payments will be based on both your incomes and both your loans. This is a nice feature because it's pretty unreasonable to have to people making larger payments if they both have loans.
If you're married filing separately, if you sign up for IBR they will only take your income into account. I think the maximum AGI is $50k but it could still be worth trying if you're close. If your wife's payments are $0 I would speculate she's already doing this.
https://studentloans.gov/myDirectLoan/formLibrary.action?_ga=2.226397210.1440077090.1568199521-29932...Or go to the loan servicing collection link on the right side of the Federal Loan - IFAP website. It's under forms, which will take you to the site above.
https://ifap.ed.gov/ifap/It's also called:
"Financial disclosure for reasonable and affordable rehabilitation payments"
