She will need to amend her return because the IRS only gives two options if you are married and those are married filing jointly and married filing separately. However, if the IRS rejects your return, then you will have the opportunity to make any necessary corrections, add anything that was left off, and resubmit your return. The instructions to amend are below:

https://ttlc.intuit.com/replies/3288565

The link below will help to determine which filing status may be best for you all. 

https://turbotax.intuit.com/tax-tips/marriage/should-you-and-your-spouse-file-taxes-jointly-or-separ...