Hello Yale21921, thank you for reaching out to us here regarding this concern. To my understanding only the primary user has access to the billing information and there can only be one primary user on the account at a time. The best way to give your wife access is to give her your user information or change the primary username and password to fit her preferences, then you can take over one of the secondary users.
Hello Yale21921, I don't see a private message or a reply back from you here so I will close this thread as completed. Feel free to create another post if you require further assistance, have a good day.