Known For. Jack Reacher Sandy. (). The Captive Cass. () Mona Wilder. - Nice Jacket () Mona Wilder . Trivia: Daughter of Cheryl-Lee Fast. Janel Meilani Parrish (born October 30, ) is an American actress and singer. She is best known for playing Mona Vanderwaal on the Freeform mystery Her parents are former bodybuilders, and her mother worked for a Honolulu health club. In November , Parrish began portraying Sandy Dumbrowski in a.