Education

If your tax return is being rejected, then either she or someone else claimed her.   Look at the tax return she filed.   Is the box under filing status that says ''Someone can claim me'' marked on her return?   It should be.   If it is not marked, she claimed herself.  If it is marked, someone else claimed her.   You can still claim her, but you are going to have to file by mail as you won't be able to e-file.  Once an SSN is claimed, it can't be e-filed on another return.   She will need to file an amended tax return later, but you are still going to have to file by mail, unfortunately.