I'm probably the only one who noticed that the name of the author (Melissa Mueller) is missing in the credits of the movie. Instead they list the book title and the German publishing house Claassen (???).
I'm glad that at least the imdb was listing Melissa Mueller among the writers.
Actually, if you watch at the beginning it mentions Melissa Muller
"the following dramatization is based on Melissa Muller's biography of Anne Frank and original research and interviews by Kirk Ellis.
Some of the scenes in the film can also be found in Anne Frank, the Diary of a Young Girl, but the film does not use the words that Anne used in the Diary to express her feelings."
you can find this on youtube.