Nefertiti: Who Does She Belong To?

The famous bust of Nefertiti, queen of ancient Egypt, wife of Akhenaten, the heretic pharaoh of the 18th dynasty, has been on display in the Neues Museum in Berlin since 1913. But why is it not, as valuable as it is, in its country of origin, where it was discovered in December 1912 by the German archaeologist Ludwig Borchardt?