Story highlights "They didn't sell the girl," says boy who claims to be Maria's brother

"I didn't have any food to give to the kid," purported mother says

DNA test will be done Friday to determine if Bulargian woman's claim is true

Greece authorities took Maria from Roma home last week

A Bulgarian woman claims she is the mother of the blond, blue-eyed girl taken by police from a Roma couple in Greece last week.

The mystery of "Maria," who is believed to be 5 to 6 years old, prompted an international search for the girl's biological family and answers to how she ended up in a Roma community in central Greece.

The woman told Bulgarian investigators that she left the girl in Greece with a family she worked for in 2009, Bulgarian Interior Ministry General Secretary Svetlozar Lazarov said Thursday.

"We gave her, we gifted her, without money," Sashka Ruseva told Bulgaria's TV7 Thursday. "I didn't take any money. I didn't have any food to give to the kid. I saw it yesterday and I've been sick. I haven't eaten since last night."

Maria's photograph has been broadcast worldwide.

Her 15-year-old son also spoke to reporters outside of the police station where they were questioned. Isak Ruseva said his mother "became sad and started crying" when she saw the child in television Wednesday.

"They didn't sell the girl," he said. "They didn't have money to come back and that's why they left her."

DNA testing set for Friday

A DNA sample will be taken from Ruseva on Friday for comparison with the child in Greece, Lazarov told CNN. Greek officials did not respond when CNN asked if they were providing the child's DNA results to Bulgarian authorities.

Photos: Photos: Greece's mystery girl Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – This young girl, reportedly named Maria, was taken in by authorities Thursday, October 17, after she was found in a Roma community near Farsala, Greece. A Roma couple was initially charged with abducting her and falsifying official documents, and the case has generated huge interest in Greece. Hide Caption 1 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – DNA tests have shown that Sasha Ruseva -- who according to neighbors in her Bulgarian Roma village lives in a single-room home with up to nine other children -- is Maria's biological mother. "We gave her away. I didn't take any money. I didn't have any food to give to her. Since I saw her on the TV, I've been sick," Ruseva told in Bulgaria's TV7. Hide Caption 2 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – Living conditions in the Roma village of Nikolaevo, where Saska Ruseva and Atanas Rusev live, are rudimentary. Horse-drawn carts are still used for transportation of people and goods. Hide Caption 3 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – Maria's 14-year-old sister, Minka, holds a faded newspaper photograph of her little sister on Saturday, October 26 in Nikolaevo. The two have never met. Hide Caption 4 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – In this handout photo provided by police, suspects Eleftheria Dimopoulou, 40, and Christos Salis, 39, sit with the girl. A lawyer for the couple told the Reuters news agency that the couple adopted the girl with the permission of her biological mother. Hide Caption 5 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – The couple's lawyer conceded that the adoption was "nonlegal," but he said he believed the girl's biological mother would verify the couple's claims. Hide Caption 6 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – Authorities asked questions about the girl because she has fair skin and blond hair while her parents have darker complexions typical of Roma. The Romany people, historically called Gypsies, are a race descended from Indian nomads. They face widespread discrimination in Europe. Hide Caption 7 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – Roma children play next to a Roma settlement in Farsala, Greece, on Saturday, October 19. Haralambos Dimitriou, head of the local Roma community, said Dimopoulou and Salis raised Maria like a "normal" child. Hide Caption 8 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – A Roma woman walks next to the house where the family lived in Farsala. A spokesman for Smile of the Child, the charity that took Maria in, said the girl was found in "bad living conditions, poor hygiene." Hide Caption 9 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – Medical tests indicate the girl is 5 to 6 years of age, slightly older than initially thought, said Smile of the Child spokesman Panagiotis Pardalis. Hide Caption 10 of 11 Photos: Photos: Greece's mystery girl 'Maria': Greece's mystery girl – Thousands of calls poured into Greece after authorities released photos of the girl. Authorities released photos of the two adults hoping that someone can provide more information about them. Hide Caption 11 of 11

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Greek authorities charged the Roma couple who had Maria until last week -- Eleftheria Dimopoulou, 40, and Christos Salis, 39 -- Roma couple with abducting the child. They appeared in court Monday and were both remanded into custody pending trial.

Authorities initially asked questions about Maria because she has fair skin and blond hair, while the couple who said they were her parents have darker complexions typical of Roma, a people descended from Indian nomads and who face widespread discrimination in Europe.

Medical tests showed she wasn't their daughter, authorities have said. The girl's DNA didn't match any profile in Interpol's database, the international law enforcement agency said Tuesday.

Their lawyers say the couple took the child into their home after her biological mother, who they say was from Bulgaria, was unable to look after her.

Residents of the Roma community backed that assertion in interviews with CNN.

"Maria used to play here with the other children and go to the store with her mum. Maria was not hidden away," Maria Kaleas said. "The mother gave her away and Eleftheria was enchanted by Maria's beauty. She shared the food for her own children with Maria."

Interpol said Greek authorities have asked for its help in finding out Maria's identity. "Until now, a comparison of the girl's profile against Interpol's global DNA database has not produced a match," Interpol said in a news release.

The agency has more than 600 missing people listed on its website, 32 of whom are 5 or 6 years old.

A spokesman for a Greek children's charity said that about 10 cases of missing children around the world are "being taken very seriously" in connection with Maria's case.

"They include children from the United States, Canada, Poland and France," said Panagiotis Pardalis of the Smile of the Child charity.

The Smile of the Child said the girl, who was found a week ago, is being cared for in a group home.

Blond child returned to Roma family in Ireland

As Maria's story became global news, another mystery emerged in Dublin, Ireland when authorities took a blond, blue-eyed girl from a Roma couple there. Police, acting on a tip, removed the 7-year-old girl from a home on Monday and placed her in protective care.

But the child was returned to the couple after DNA test confirmed she is their daughter, a source familiar with the case's legal proceedings told CNN on Wednesday.

The parents, who live in the suburb of Tallaght, told CNN they have a passport for the girl, but they do not call her by the name on the passport.

Their attorney said the couple is going to take some time before considering their legal options, the British Press Association reported.

"Her parents greatly appreciate the help and assistance that they have been given by friends and relatives over the last few days," Waheed Mudah told the PA. "They now intend to concentrate on looking after their family and, in particular, in trying to reassure their daughter that she will be in their care."

Prejudice against the Roma

Prejudice and discrimination against the Roma are widespread in Greece and elsewhere in Europe, Amnesty International says.

Maria's case plays into old prejudices about them stealing children for forced labor.

Pardalis, with the charity now caring for her, mentioned such a possibility, saying, "We don't have any other information if this girl was forced to work or to beg on streets."

The Greek government news agency also raised "the possibility of the existence of a ring bringing pregnant women to Greece from Bulgaria and then taking their children for sale." The agency cited past reports that empty coffins had been found for infants who supposedly were stillborn to foreign mothers in Athens.