If she was indifferent I would be worried, if she didn't care I would be worried, but someone who says that in anger still cares, love & hate aren't opposite emotions, they're actually polar extremes of the same feeling (I read that somewhere don't quote me), love/hate and indifference are opposites. Indifference meaning I don't care enough to feel love or hate about you.
Hmmm... She did try to say it as plainly as possible, but like I said, it did have a bit of a "zing" to it, like she was trying to hurt me. There was no other reason to say it, and certainly not like that.
I agree 100% that love and hate are extremes of the same feeling.