It is impossible to verify Ziawudun's account completely because of the severe restrictions China places on reporters in the country, but travel documents and immigration records she provided to the BBC corroborate the timeline of her story. Her descriptions of the camp in Xinyuan county - known in Uighur as Kunes county - match satellite imagery analysed by the BBC, and her descriptions of daily life inside the camp, as well as the nature and methods of the abuse, correspond with other accounts from former detainees.
Internal documents from the Kunes county justice system from 2017 and 2018, provided to the BBC by Adrian Zenz, a leading expert on China's policies in Xinjiang, detail planning and spending for "transformation through education" of "key groups" - a common euphemism in China for the indoctrination of the Uighurs. In one Kunes document, the "education" process is described as "washing brains, cleansing hearts, strengthening righteousness and eliminating evil".
The BBC also interviewed a Kazakh woman from Xinjiang who was detained for 18 months in the camp system, who said she was forced to strip Uighur women naked and handcuff them, before leaving them alone with Chinese men. Afterwards, she cleaned the rooms, she said.
"My job was to remove their clothes above the waist and handcuff them so they cannot move," said Gulzira Auelkhan, crossing her wrists behind her head to demonstrate. "Then I would leave the women in the room and a man would enter - some Chinese man from outside or policeman. I sat silently next to the door, and when the man left the room I took the woman for a shower."
The Chinese men "would pay money to have their pick of the prettiest young inmates", she said.
Some former detainees of the camps have described being forced to assist guards or face punishment. Auelkhan said she was powerless to resist or intervene.
Asked if there was a system of organised rape, she said: "Yes, rape."
"They forced me to go into that room," she said. "They forced me to take off those women's clothes and to restrain their hands and leave the room."
Some of the women who were taken away from the cells at night were never returned, Ziawudun said. Those who were brought back were threatened against telling others in the cell what had happened to them.
"You can't tell anyone what happened, you can only lie down quietly," she said. "It is designed to destroy everyone's spirit."
Mr Zenz told the BBC that the testimony gathered for this story was "some of the most horrendous evidence I have seen since the atrocity began".
"This confirms the very worst of what we have heard before," he said. "It provides authoritative and detailed evidence of sexual abuse and torture at a level clearly greater than what we had assumed."