Still surprised she got >30%, thats a lot of angry voters and rather large non-voting contingent is present here as well. Like I said, nothing ends until it really does.
Her father got 0.75% the first time he ran in the 70s, then 14.39% in 1988 (1st round), 15% in 1995 (1st round), 16.86% in 2002 (1st round) and 17.79% in (2nd round). Then he lost support to ~10% in the next election (during a rather nice boom i should say, and probably because Sarkozy was such a massive personality), he retired and gave up to his daughter who during recession gained back all the lost votes to ~17% again.
Now she commands 35%... that's huge, if we talk in terms of just increasing vote share from 1st to 2nd round she gained ~15% while her father could only muster a measly 1%.
Like the Tories with UKIP (only more advanced), the other parties will concede policies due to this and FN will get what they want anyway.