Her ordeal began in 2006 when her 10-year-old daughter disappeared from home. Unbeknown to Tang Hui, the girl had been raped and then lured to a local karaoke centre by a man she'd met. There she was gang raped again by four men, beaten and forced to work as a prostitute.
Local police did little to track down the missing girl, saying she'd probably run away from home. Tang Hui didn't give up and, after three months searching her hometown of Yongzhou, discovered where her daughter was being held. Only then did the authorities act, freeing the girl and arresting her captors.
Tang Hui campaigned vigorously for the death penalty for the men who did it. But she says the pimps had powerful connections in the police force, and the bad publicity the case brought may have tarnished the careers of local officials.
So those same police and officials had Tang Hui sent to Zhuzhou Baimalong camp to undergo 18 months of re-education. She says it was an act of revenge to silence her. Her re-education meant being told she must obey whatever the Communist Party says.
China's new Premier Li Keqiang has signalled his government is prepared to start the process of reforming the widely-despised system of re-education camps