DNA tests have confirmed that a 35-year-old Bulgarian Roma woman is the mother of the mysterious girl found in Greece and known only as Maria.
A genetic profile of Sasha Ruseva matched that of the girl.
Ruseva has said she gave birth to a baby girl four years ago while working as an olive picker, but gave her away because she was too poor to care for her.
The mother was living in Greece at the time.
Maria has been placed in temporary care since last week after authorities raided a Roma gypsy settlement in central Greece and discovered her there.