We need more information.
If you were not yet married, she would file as single (or maybe head of household if she qualifies). She can buy turbotax for the previous years at this link. (Each year is different, 2023, 2022, etc.)
Products for previous tax years
If you were married as of 12/31 of the year, then your choices are to file a married filing jointly or married filing separately.
With MFJ, you list all your combined income, deductions, dependents and credits on one tax return. If you already filed, you would amend your return to add her info. With MFS, each spouse files a separate return listing only their own income, deductions, and so on. MFJ is almost always better because MFS has higher tax rates and some deductions are limited or disallowed, but sometimes there are reasons to do this, we would need to know more.
Also note, if you originally filed MFJ but omitted your spouse's information, your only choice is to amend the return and add her information. If you originally filed MFS, you have the option of amending to a joint return, or leaving your separate return alone and filing a separate return for her.
