I'm Iranian, work in Shanghai, how to apply z visa for my wife?

Hello. nee your help .
I'm an Iran citizen currently working in Shanghai with work visa /One year residence visa, now I would like to apply residence permit for my wife (also Iran citizen), but Shanghai exit-entry adiminstration said my wife must apply z visa from China Embassy in Iran.
Now my wife is in Shanghai with L visa , what should we do ?
As I know Z visa is for foreigners who will work in Shanghai, but my wife will not work here .

What docs you need to release the Z visa to my wife ? Does she must back to Iran ? thanks