As the grande dame of Latin American actresses, Norma Aleandro is accustomed to having choice roles gravitate in her direction. So it was with some apprehension that the director-screenwriter Jorge Gaggero, 37, approached Ms. Aleandro for his first feature-length film. He needn't have worried. As soon as Ms. Aleandro, 71, read the script, she was won over. The result is "Live-In Maid,," which opens Wednesday at Film Forum in New York. Larry Rohter reports.