This is no surprise (she's national front and wants to get rid of all those brown people camping on her patch. And she wants you to have them! So much for far right solidarity).
Fortunately for Britain, she has precisely zero say in the matter, and a remain vote would have kept things that way.
What's changed is that the French government may now, in the fullness of time, either decide that she is right, or decide that sacrificing the Le Touquet treaty is a worthwhile manoeuvre to head off the far right in France. If brexit happens (and Boris seems to have gone surprisingly cool on it) then I give Le Touquet a very short life expectancy.