knit-in.
You need to call CO and have them "split the record" if you don't mind only one of you getting an upgrade. EUA will only process ALL people on a record at the level of the lowest elite level of those on the record. If your wife is a NW silver, tht puts BOTH of you at the lowest level possible, behind other CO silvers. If you are both on the same record, its both or neither. With only two seats left, you risk one of the seats going to someone else and then neither of you will get the other if the record is not split.