Actress Susan Buckner, best known for her role as a high school cheerleader in the hit movie “Grease,” has died. She was 72. Buckner “died peacefully on May 2 surrounded by loved ones,” publicist Melissa Berthier told People magazine. Her cause of death wasn’t disclosed. Buckner’s daughter, Samantha Mansfield, said of her mom, “The light she brought into every room will be missed forever.” “She was magic, and I was very lucky to call her my best friend,” Mansfield told People. Buckner, born in Seattle, was a beauty queen who won the Miss Washington crown in 1971 and represented the state in th…