LOS ANGELES: Madonna’s film efforts haven’t received the highest praise in the past, but the 54-year-old queen of pop may try her hand at directing once again with an adaptation of the recently released novel “The Impossible Lives of Greta Wells.”  Andrew Sean Greer, author of “Greta Wells,” told SF Weekly that Madonna called him personally to discuss obtaining the rights for a movie. It’s unclear whether the singer will simply produce, as Greer speculated, or take on a larger role with the project.–HP