Born in Tallinn, Estonia, Mirell began her training in Los Angeles, California at the Yuri Grigoriev School of Ballet. She continued her professional training at the Central Pennsylvania Youth Ballet under the direction of Marcia Dale Weary. She has spent summers dancing with Complexions Contemporary Ballet, Boston Ballet, the Kirov Academy and the Rock School. Last season she danced professionally with the Oklahoma City Ballet, and most recently danced with the Eugene Ballet. This is her first season with NBT.