https://www.lefigaro.fr/nantes/crash...otage-20230629
Basically the report says that the crash was due to the pilot's lack of experience of flying in mountainous areas. He had only 230 hours total experience, and probably no experience at all of mountain flying. The route he flew took no account of the steepness of the mountain, the lack of power of his aircraft to be able to climb sufficiently to clear the summit, and also the narrowing of the valley making it difficult to turn and fly out.
The daughter was the only survivor, badly burned, subsequently spending 16 months in hospital and physical rehabilitation, now returned to her home region.