When 18-year-old Riley Cooper first read the play "Holka Polka," she knew she had to direct it.The play which opens July 13 will be Cooper's directing debut."I read it and fell in love with it," Cooper said. "I fell in love with the story and how it changed the fairytales so much, but through it all it kept the essence of those well-known fairytales."Written by D.M. Larson, "Holka Polka" is a children's play about the nicest witch in Fairytale Land who embarks on a journey to save all witches' reputations by saving the prince. Along the way she meets some …