I am assuming that you are trying to file jointly.
If so, I suggest you work with your spouse to do so.
Probably the cheapest solution is to ask her for her SSN, and cooperate in terms of filing the return and make financial arrangements for paying any taxes due or splitting any refund.
(Note that by filing jointly you each have to sign the return, and you each have full responsibility for accuracy and amount due.)
If she has income and has to file a tax return, the above approach may also save her money.
If you are working with attorneys you may want to consult your attorney.
If the above approach is not possible, you can file single, but that will likely result in higher taxes.
However, that cost may be worth it to you or her, or both.
