A number of politicians have lambasted the judges' decision towards Le Pen.
On Thursday, she tweeted a decision ordering a psychiatric exam that was dated September 12 and gives her 10 days to modify questions to be asked. "Just how far will they go?" she tweeted.
The leader of the National Rally broke the news herself in a (French-language) tweet, saying that the psych evaluation was ordered as part of the charges she faces for posting graphic images of ISIS executions, reports Reuters.
In March Le Pen was charged with circulating "violent messages that incite terrorism or pornography or seriously harm human dignity" and that can be viewed by a minor.
The politician, who was runner-up to Emmanuel Macron in last year's French presidential election, posted images of the body of murdered USA journalist James Foley in December 2015. "I will wait to see how the magistrate intends to force me", she said.
"It's insane", Ms Le Pen tweeted.
According to court documents posted on Twitter by the leader of the National Front party, the psychological tests are to be carried out "as soon as possible" to establish whether she "is capable of understanding remarks and answering questions". Italy's Interior Minister Matteo Salvini said in a statement.
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Itself, marine Le Pen said that she was sent to a psychiatrist because she condemned the actions of terrorists. "A court orders a psychiatric assessment for Marine Le Pen".
Le Pen later said she would skip the test.
The court order has already rallied support behind Le Pen among leading members of Europe's nationalist movement.
Calling this an "unacceptable slip" and "foul words", Le Pen had posted three photos mentioning Bourdin with the text, "That is ISIS", on her Twitter account.
She was stripped of parliamentary immunity in November a year ago.
Last week, she repeated warnings that her party's existence was at stake if it didn't manage to win back two million euros in subsidies seized as part of an inquiry into claims it misused millions' worth of European Parliament funds.