Try writing her a letter, revealing ALL of your feelings, and then just give her more time. Don't ask her to write back, just let her know that whatever she decides, you know that she's doing what she feels is best for her. I just saw where you said you feel like starting WWIII with her, but please dont ever grow to dislike her. People think that capricorns are cold, but all she's revealing is just how sensitive she is, and how deep her hurt goes when she feels she's betrayed...although she may just be dragging it out a little.
And yeah, she probably did develop feelings for you aswell. In her mind, it's probably best that the friendship isn't as strong because she may just feel guilty IF she's developed any feelings. Now I'm not sure about the feelings part so don't go asking her or mentioning it. That would make her even more upset.