Mr. Yuan tried to communicate by using his phone as a translation device, but Phyu refused to speak. She was locked in a room with a television. In the evenings, he would come in and inject her arm and then force her to have sex, she said.

“I felt numb,” Phyu said. “He smelled sour. He smoked.”

Eventually, she pretended to be happy, Phyu said, and the injections stopped. They went out to a shopping center, but Mr. Yuan followed her everywhere, even to the bathroom. Another time, they went to an amusement park with Mr. Yuan’s sister and her young children. He rode the rides. Phyu did not.

Phyu learned some phrases in Mandarin. “‘Bu ku le’ means ‘don’t cry,’” she said.

She learned the passcode to her husband’s phone, and when he was drunk at night she called her mother through a social media app.

“I was glad to see her, but she didn’t look like herself,” Ms. Aye Oo, her mother, said. “She said, ‘Ma, I’ve been sold.’”

Nyo wasn’t sure where she had been taken in China, but she was determined to find out. At first, Gao Ji, her husband, also locked her in a room without any internet. He beat her, Nyo said.

But as the days passed, he began to trust her and allowed her to use social media, including WeChat, the Chinese social media platform.

Mr. Gao’s mother, who lived with them, fretted that Nyo was too thin to bear children. She made her foreign daughter-in-law fortifying rice porridge, thick wheat noodles and steamed buns.