This book is a fraud. It purports to be the true story of a holocaust survivor. In fact, the author, who isn't even Jewish, didn't do any of the things she relates in the bok. She didn't live with a pack of wolves, didn't cross Europe in a 1900 mile trek in search of her parents, didn't kill a German soldier in self-defense. She has repeated her lies again and again. Now she has finally admitted that the whole thing was a fantasy.
Why not just write it as fiction from the start? Maybe because it wouldn't have been a best-seller, wouldn't have been made into a movie.