LONDON (AP) — It is a bittersweet moment for Queen Elizabeth II. She is visiting a country she loves, on what may be her final visit to an organization she cherishes — one that might struggle without her.The 89-year-old British monarch was flying Thursday to the Mediterranean island of Malta, where she once lived as a young princess, for a summit of the Commonwealth, the post-colonial international alliance she has helped for decades to unite.Between 1949 and 1951, Elizabeth's husband Prince Philip was stationed on the island as a Royal Navy officer, and she lived the relatively ordinary life of a military wife, rather than a duty-burdened heir to the throne."She was able to drive her own car around, go to the cinema, go to polo matches, go to dances at the Phoenicia Hotel," said royal biographer Hugo Vickers.