Inside Queen Elizabeth II's final royal engagement, a monarch 'devoted' to service

Queen Elizabeth II’s final royal engagement was Tuesday, Sept. 6, at Balmoral Castle in Scotland. She appointed new Prime Minister Liz Truss just a few days before her passing.  On her 21st birthday in 1947, then-Princess Elizabeth went on the radio and made a promise to Britain and its commonwealth nations.  At the time, she pledged that "my whole life, whether it be short or long, will be devoted to your service." The long-reigning monarch has fulfilled that vow over the years,