( CNN ) -- A blond girl found in Greece whose birth parents were traced to a Bulgarian Roma village will be cared for by a foster family when she 's returned to Bulgaria , the government 's social services agency said . Maria , as the girl was known by the Roma couple with whom she was living in central Greece , was at the center of an international mystery after police discovered her . DNA tests eventually showed that Saska Ruseva and her husband , Atanas Rusev , were her biological parents . Her mother told CNN that she wants her child back -- but that seems unlikely to happen for now . Maria , now being cared for by Greek children 's charity Smile of a Child , will instead be cared for by a foster family . The parents and their nine children have been living in poverty in a tumbledown , one-room mud brick house in the village of Nikolaevo , in central Bulgaria . Emil Todorov , director of the Children Protection Department of Bulgaria 's Agency for Social Assistance , told CNN it was not yet clear what documents Maria would arrive with . Bulgaria 's State Child Protection Agency has yet to say exactly when and how the girl will be brought from Greece , he said . Her interactions with her birth family will be determined by who is named as her legal guardian , he said . The Agency for Social Assistance is also taking action to care for the Bulgarian parents ' seven underage children . The two youngest , ages 2 and 3 , will stay with one foster family , said Todorov . Two other children will stay with another foster family , and a 15-year-old will stay with family members . The remaining two , ages 8 and 12 , will be staying at a specialized institution , because no appropriate foster families are available to take them in , he said . Working with the parents . The placement of the children in foster care is only a temporary stage , Todorov said . The goal is to give the parents the chance to improve their living conditions -- in which case they can be reunited with their children . Social services will help the parents find a job , he said . `` We have to work with both parents , so that they can expand their parental potential , '' said Todorov . While the children are in foster care , social workers will encourage frequent meetings with their parents , so that the family maintains its emotional connection , he said . `` We do n't take away the children , '' he said . `` We count on the collaboration by the whole family to cope with this difficult situation . '' The Agency for Social Assistance said it had determined the parents had another child too , who was `` abandoned by her parents and raised by a family in another city . '' Bulgarian police are investigating the Rusevs on suspicion they sold Maria for illegal adoption . A Greek Roma couple -- Christos Salis and Eleftheria Dimopoulo -- who were found looking after the girl are in custody , charged with kidnapping . Daughter given away , says mother . Ruseva told CNN that she and her husband left for Greece in 2009 to look for farm work . She says she left her eldest daughter Katia , now 20 years old , to care for the family while they were away . Ruseva says she was so thin she did not realize she was pregnant with Maria . `` I did n't know I was pregnant . I did n't even have a belly , '' she said . Maria -- whom Ruseva originally named Stanka -- was born in a hospital in the Greek town of Lamia , about 70 kilometers ( 44 miles ) from Farsala and the Roma camp where she was discovered this month . Ruseva said she cared for Maria for seven months while her husband worked in poorly paying odd jobs , picking fruit and vegetables . They often slept in the streets or nearby olive groves , as they had so little money . Then one day , when they took a job picking oranges , a woman offered to take care of their daughter and they gave her to the woman because they could n't care for her themselves , Ruseva said . She denies selling the baby , saying she loves her and wants her back . CNN 's Karl Penhaul contributed to this report .
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 . Comment: The couple 's other underage children will now be cared for by authorities .