I'm a big fan of her! She as a particular way to talk about history completely hipnotic to me. She's specialized in Middle Ages and some great woman's of that time, like Cristine de Pisan, Hildegard Von Bigen, Blanche de Catille or Joan d'Arc. The first book that I read of her, was: "Woman in Middle Ages". I follow her steps (her books) when I was in colledge and I continue to read her and discover some more details about this incredible woman who died in 1998. In this moment, I'm reading again "Women in the Days of Cathedrals" and I'm not tired of it.*S*

I leave you some links to her books and other subjects:
Books
Books and articles (french)
Pernoud's article: Woman in History (spanish)