NEW : Social workers will continue to help parents improve living conditions so children can return . Maria will be cared for by a foster family in Bulgaria , authorities there say . Her foster parents were found to be a Roma couple in Bulgaria . The family 's other underage children will now be cared for by parents .
NEW : Social workers will try to help parents improve living conditions so children can return . Maria will be cared for by a foster family in Bulgaria , authorities there say . Her birth parents were found to be a Roma couple in Bulgaria . The couple 's other underage children will now be cared for by authorities .