You should call the employer help line for confirmation. I agree with the above comment, except that if you suspend her pending the resolution of this situation, will a willingness to take her back if it is proved that she is legally able to work, you have broken no laws.
It's crazy that fingerprint technology is so backward!
As for Amanda...I don't know, and have been wondering the same. She's a busy lady, so maybe work has taken up too much time of late. I'l drop her a line tomorrow anyway, as I have some work for her.
We will either give advice or can make the application for you.
I would say you have a head start, as she has already been granted a visit visa to see you, they are happy with her intent to return, and she now has a good immigration history.