The key portion in the text here, IMHO, is the fact that her DNA is not related to the people masquerading as her parents. So either she was (a) sold without going through an adoption process, or (b) she was abducted, with the intent perhaps to be sold later on.
More here. H/T Kitman
White slavery making a comeback?
It turns out she was their adopted daughter. Oh noes, those evil gypsies.
How about supplying a link so I can update the post?