you read her books?  or diaries 
Both, but I like her books a lot better. It was hard for me to stay interested in her diary.
heard it's great book.  the author was born in France 
Yes she was! She spent formative time in France as well as in America. Have you come across any of her works? It doesn't seem like many people do.
she died of cervical cancer in 1977  in California 
Oh I didn't know that. That's rough.
she had also a charitable foundation, you hear about it? 
I know she had a foundation and she was invested in teaching young writers when she was alive.
she also wrote a Student Encyclopedia
Yes, that's right. She wrote "Novel of the Future" to help guide emerging writers, that's one of my favorite.