You would have to amend the Joint returns. And it is too late to get any refunds from them. You probably need her signature. Ask your attorney.
How to amend. You can only use Turbo Tax to amend the last 3 years unless you have the 2014 program already installed on your computer.
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
