She was asked whether "France" was "responsible" for said round up. She said she thought not.
The reason being that France was under occupation and shouldn't therefore be considered an independent country.
In other words, the real France was represented by de Gaulle in exile in London and the Resistance, rather than Pétain in Vichy and the occupation-sanctioned government - which was who did the rounding up.
So, she didn't doubt the French "fascist" government rounded up Jews. She said that precisely because the "fascist" government was not legitimate, France as a country ought not to be considered responsible for that government's actions.
When someone dismisses an entire argument based on the other's political leaning, their own arguments should only be afforded the same courtesy they were willing to extend to their opponents.