Ah yes, brushing a cat can be quite difficult. Whenever I try to brush my cat, he usually runs under my bed, and when he doesn't and I am fortunated to get a little brushing in, he runs off. Anyways, in your case, maybe the brush is too hard for your kitty, and a softer. Perhaps, if you played a game with your cat before you tried to brush her, maybe it'll be too tired to run off.