I would say that she really manages to hate Darcy. She gets very good reasons for that, "determined to hate" him as she was :
"Heaven forbid!—That would be the greatest misfortune of all!—To find a man agreeable whom one is determined to hate!—Do not wish me such an evil."
But why she wants to dislike him at first, then to hate him, I find a very interesting question, isn't it? ;-)
At that point I admit that we don't know yet if she really hates Mr Darcy, or if it is mere anger.