So far as I can remember the only documents that the Registrar needed to see was her passport with the appropriate visa in it and my divorce certificate to show I was free to marry. It was all very simple and straight forward. When we arrived we queued separately and I asked the officer whether I could have waited with my then fiance, who was clearly nervous. He said that they encourage that, so that we can answer any questions they might have. So I would definately go in the queue with her. You will have to wait anyway so why not?