I'm not sure. It could be a blend of real and made-up. Maybe it started with a kernel of truth and then the storyteller took creative liberties to shape it into what we see.
Hard to say for sure. Sometimes movies or shows claim to be based on true events but have a lot of fictional elements mixed in. So, it could be a blend of fact and fiction in 'The Girl from Oslo'.
Well, actually, the Oslo movie is indeed based on a true story. It takes elements from real-life situations and weaves them into a compelling narrative. However, there might be some artistic liberties taken for cinematic effect.