The couple says the girl had various medical problems and also erratic eating habits, including periods of binging and self-starvation. They say she was not allowed from her room at night because of bizarre behavior during eating sprees, including rummaging through garbage for food.
Officials in Qatar also have raised questions about the adoption procedures in Huangs' case, including payments to an adoption agency. This is likely because adoption is virtually unknown in traditional Gulf Arab societies, where extended families would provide care.
In addition, an investigative report by Qatari police raised questions about why the Huangs would adopt children who did not share their "hereditary traits" and raised concerns that the children were part of a human trafficking operation or were "bought" for organ harvesting, according to the family's website.
The couple has two other children adopted from Africa. The children left Qatar last month to live with relatives in the U.S.