I have never read it anywhere that she read a wig. The movies and series about our royal family are painfully amateuristic, overly theatrical, dramatized and to a large extent fictional. In one of these series there is an entirely fictional conversation between Beatrix and Bernhard -about Bernhard's interviews with the Volkskrant that were published posthumously - while it is widely known that Beatrix only discovered about these interviews when they were published, after her father died (in shock she apparently said: 'which man did we bury?'.
The broadcasters who order such series/movies are usually from the public channels. This means that there are budget restraints which has its effects on the script and set. Many of these series/movies are made by the same script writer -Tomas Ross- an ardent republican who made a career out of spewing all kinds of conspiracy theories around the royal family. His last movie was about Pss Mabel who supposedly had to be rescued in the Libyan desert during the revolution while she was there as an undercover agent for the Dutch government.
The only believable portrayal of a member of the RF was in the television series about the late prime minister Den Uyl, where his many meetings with Queen Juliana & the Lockheed affair had a central role.