My daughter is in South America on midway through an Avios booking that I booked for her. She rang BA to change the return, and (she believes) succeeded. The new return is showing on MMB. However, neither of us has received the notification of the booking change by email. For new bookings, and (I think?) for changes, this is sometimes an indication that the flight has not been (re-)ticketed. What is the canonical way of determining whether the flight has been re-ticketed after a booking change? She is understandably reluctant to spend a long time on hold to BA with no roaming and either no or dodgy WiFi.