Long before she married, at 14, Sushila Sunar had stopped going to school. She never learned to read. After her two children were born, she broke rocks at a construction site for a few dollars a day, the only work she could find. Then a woman approached Sunar with a job that paid nearly $6,000, a sum so large she and her husband felt she could not refuse. She became a surrogate mother, delivering a light-skinned baby for a foreign couple she never met.