I'm very uncomfortable with watching a movie where we can only be presented with one side of the story. The mother can say whatever she likes about child protection services in Norway, but due to privacy regulations they cannot defent themselves or respond to specific accusations.
There's two sides to every story. I'm confident that all due process would have been followed, and the children wouldn't have been taken away unless there was a very good reason.
The mother obviously will not publicly disclose any information which might portray her in a negative light.