My little heifer show calf is just shy of a year old, literally 5 days away. She has been trained and halter broken since she was 4 months old. Over the past few days, she has been head butting her mama and she has been pinning me up against gates and head butting me in the stomach. I push her back and smack her nose real hard every time she does this, but I'm not sure what else to do to stop her from doing this. My mom thinks that she is acting this way because when my friends walk her, they let her get away with misbehaving. Even though I try shipping her back into shape, she still misbehaves. What should I do??