There is nothing in between. It is like black and white. She only goes to extremes. Could she just "like" you? No, if she does not love you, she hates you. Could she just "dislike" you? No, it's either love or hate. Some people might have a scale of emotions: love, like, indifferent, dislike, hate. She only has two: love and hate.

All or nothing means the opposite end of each extreme. For example, the opposite of love is hate. She will love you or hate you. There is no "middle" which could be "likes you" or "doesn't like you".