What a joke! To determine whether someone is a legal alien, you rely on an affidavit from the alien? I'm sure there are hundreds of millions of people around the world who would be delighted to sign such affidavits, if the US government were willing to rely on them!
Show us the immigration documents proving she was legal at the time. And not just legal to be in the country. Legal to work! Of course, if they had such documents, they would have released them.