If Le Pen gets enough votes. She will win. If not, she will lose. This 'rounding on Le Pen' talk is daft. Who voted for the 'other' parties? French people.
This 'other parties will gang up on Le Pen' line is a bit daft. If you want Le Pen to win the election, you vote for Le Pen, not the other parties. Being outvoted is not being ganged up on.