After about a week of waiting for any news post interview and citizenship exam, the status updated to Ceremony Will Be Scheduled, or something similar. A day later, on the new website, the oath ceremony letter appeared and the status updated to Oath Ceremony Has Been Scheduled. Today, FINALLY, the I751 status changed to approved. So, May 10th is her Oath Ceremony, and that is the day her visa journey will be over. It's a pleasure reading this forum and posting here; the community helped keep me out of the dark during this wild ride.
Harold