What the club were recommending is that you waited until Phase 3 to get seats together, but from what I've seen, it looks like they're being rather lax with the rules anyway and you could probably have got her one when you got your own. I think they'll probably allow you to switch your ticket to sit with your missus, but you might be best off giving the ticket office a bell to make sure, they might even sort it for you over the phone(though you'd obviously still have to go in and swap the tickets over).