Regardless of who's fault it is, the bottom line is:
1. Your girl friend is going to have to file a paper return. It can't be fixed.
2. You are going to have to file an amended return and pay back some of your refund.
She does not need to wait for you do do that. She can claim full child related benefits (EIC and child tax credit). Yes, having to mail the return will delay her refund. But you should still get your erroneous refund on time. An IRS audit is unlikely, if you timely file an amended return and return the over payment. You can even wait until you get her refund before filing your amended return.
