Christine lagarde was found guilty of negligence, in favor of someone else. Marine Le Pen was found guilty of deliberately embezzling money for her own party. The cases are in no way comparable.
Lagarde allowed a different between Mr Tapis and the state to go to arbitration where a panel of three judges awarded the several millions - not her. This choice was found to be negligent by the CJR, a court composed mostly of politicians, after the pay out was invalided by the French justice system 8 years later. Lagarde was found guilty of pushing for arbitration as a minister when she shouldn’t have.
To quote the linked article: “The verdict came as a surprise as even the public prosecutor had admitted the evidence against Lagarde was “weak” during a five-day trial last week.”
This has absolutely nothing in common with what’s happening to Marine Lepen. Dozens of emails and messages prove that she presided over a setup designed to embezzle millions for the EU while being fully aware this was illegal.