That's exactly what I thought, there was no reason for backup withholding since they had the EIN. 

I believe the work was done in CA, but I'm not sure. I can ask her, but I'm not sure this would impact the present situation in any way? Am I missing something? I don't care as much about the solving the mystery of why it was withheld or whether it should have been, as much as how to account for it on the return now that it was already withheld.