"It was a miracle," she told the newspaper. But she said she began to feel angry that a mother could be so cold-blooded as to abandon not one, but two daughters.
However, the girls don't blame their biological parents at all, saying "thank you for giving us lives" in the letter.
"I don't plan to bother their biological parents. I just want to show pictures to them and let them know the girls really miss them," Bonnie was quoted as saying.
"Both of them are healthy and live happy lives now," she said. "I'm so proud of them. The elder sister is good at the high jump while the younger one likes playing tennis and the viola." In the past 10 years, Bonnie has brought the girls to China several times, visiting the Great Wall and seeing pandas in Chengdu. "The three of us all love China," she told the newspaper.
The Changde center said that in China's rural areas most families preferred boys and some abandoned girls.
It is investigating how the children came to be at the center and who might have brought them there and has issued a phone number, 966965, for anyone able to help.