I'm working with my mare to improve her being herd bound. I've been walking her through the field with halter and lead. I've been successful until yesterday. She'd pin her ears back and cut me off (walking right in front of me) towards the herd. My response is backing her up. I have a crop that I haven't brought with me as of yet. Would this be a good idea? I don't want this to turn on a bad note.