She can not be called racist because of her nationalist views. The only piece of 'evidence' that she is racist is that she wants greater limits to immigration, which does not prove anything at all. Her father may have been a racist but she wants nothing to do with hun, she even expelled him from the party and has appointed people from ethnic minorities to stand in elections.
I do not believe Le Pen is a racist just because she sees a transformation in the EU that she wishes to slow, if not stop. Statistically, it is a pragmatic approach to slow the influx of Muslim immigration, given the crime rates and problems with integration. I think Le Pen has made herself a prime target for being called a racist by opposing the utopian racial orthodoxy.