Le Pen's economic policies are surprisingly progressive or even dare i say it, left wing. She just sprinkles in the standard right wing xenophobia.
Look at Trump, he ran with a lot of traditionally left wing economic policies. Regulate wall street, protectionist trade policy, no cuts to social safety net etc.
Now in office he has just shown they were simply a bait and switch to get disenfranchised middle class people to vote for him. He had no intention to ever be anything other than a standard establishment Republican.
The same with Le Pen, whether she actually implements those left wing policies or is just using them as her trojan horse to implement the xenophobic agenda on immigration, is the real question.
The mistake people do with populist is ever using their stated policies to judge them, they just say what they think will get them elected, and anything they say are subject to change, what they say their policies are mean nothing