Why does the French prosecutor's office not investigate the situation with the money that the party Marie le Pen found on the election campaign? Because she could not take this money from the air and in reality they did not have it.
Why not investigate? Marie Le pen's immunity lifted and an investigation is underway. Have even called the Deputy who was the mediator between Le pen and Putin. Just such investigations don't happen overnight. You need to collect 100% proof to the case collapsed in court and she did not abdication of responsibility, and it is quite difficult.