It may depend on what she read -- I wonder to what extent Mr. Bennet consulted his daughters' tastes when ordering books for his library. I find it difficult to imagine that he ordered books with heroines of any description on his own. On the other hand, after JA's wonderful defense of the novel in NA, I find it hard to believe that a heroine of hers wouldn't read novels, so even if her father didn't buy them, maybe she borrowed them. And perhaps reading works of philosophy, which is the kind of book I can imagine Mr. Bennet favoring, would help an intelligent girl develop a sense of how to treat other people.