Among the hundreds of thousands of Chinese women who have settled in Taiwan after marrying men from the island, Hsu Chun-ying stood out for her political ambition. She organized other migrants from China, mingled with prominent Taiwanese politicians and came close to becoming a candidate for the legislature. Now she is in jail, fighting charges that she was recruited by the Chinese Communist Party to secretly infiltrate and influence Taiwan, the island democracy that Beijing claims as its territory. Prosecutors have accused her of taking instructions from Chinese officials to…