Short answer: NO! It is virtually impossible! She is expected to be one of the two candidates to make it through to the second round, but with a 71% disapproval rating (a large part of which could be called an abhorrence rating), there is no way that she could beat the other candidate who makes it into the runoff. Unless..... No, there just isn't an "unless." A majority of French voters would vote for anyone, even for Mickey Mouse, if he were the sole alternative to a candidate from the Front National.UK Brexiteers who dream of the French electing a candidate who will implement a Frexit are just not in touch with the reality of the French political system, nor of the mindset of French voters. Marine Le Pen is not Donald Trump, nor is she Brexit. Trump managed to win because he was the candidate of the conservative Republican Party ... not an outsider; and in the UK people voted for Brexit because it was championed by big shots from the Conservative party, not just by UKIP. Marine le Pen is a different case altogether: she does not have the support of any mainstream political party in France, except her own party the Front National.
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