I think "Be quick" is excellent advice. Be quick in catching her, be quick in getting the halter on and be quick to make her realize just how badly she's screwed up if she tries to bite, butt or kick you. A lot of horses, and in my experience, mares especially aren't real patient with people dithering around trying to catch them and then fumbling around with halter and lead rope. It tells them they've got a newbie (read victim) on their hands and they set about teaching you your place in their hierarchy. That is getting the cart before the horse, the human needs to teach the horse where the horse is in THEIR hierarchy. Hint: It's never above the human. Sit back someday and just watch the horses interact with each other. You'll see who's dominant and who's not and who's trying to move up. It isn't pretty and you don't want your horse to see you as an interloper and to try to put you back in your place, and that's where she's going with all this nasty behavior.