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Lesson learn: next time, i would make sure the entire history on a card is perfect before being added.
You could dispute it and get it remove, but the history will remain....but would be wise if you think the card will have more late payments in the future.
Do you not have your own cards?
You can delete the AU CC off your reports. The card will show as "close" but with all the history stil showing.
You will need to go to each of the bureaus' dispute link.
Actually if you dispute the AU account off your reports, you will get rid of the damage from the late payment. It's as if the card never existed. I did this with my ex. If you simply contact the credit card company and have yourself removed as an authorized user, they will update the account to read "terminated," but the account remains. So it is best to have your wife call and remove you as an authorized user and then dispute the heck out of the account until the CRA's remove it completely. They will remove it at least they did for me on three accounts. You do have to raise a big stink but it's worth it.