A 14-year-old Arizona girl who mysteriously went missing in 2019 has been found "safe, happy and healthy" in Montana, authorities said. WATCH FULL EPISODES OF WORLD NEWS TONIGHT: abc.com/shows/world-news-tonight WATCH WORLD NEWS TONIGHT ON HULU: bit.ly/3iQLwPp #worldnewstonight #abcnews #arizona #missingteen