Country, if you ride this horse, take it for a good hard ride before the farrier is to come. Get her puffing and genuinely pooped. She'll be a little more content to stand for the farrier. But, in case she isn't, keep your lunge line on her and the moment she gives the farrier any trouble lunge her, not in circles but more like half circles and make her reverse. Do this four or five times then ask her to stand. Do it as many times as you have to until she figures out she can work or behave. It sometimes takes 3 times for a horse to figure this out. You'll want to do this outside where there's plenty of room to lunge her. When lunging make her trot briskly but not canter. You're calling the shots now, not her. Let the farrier know in advance so he'll know to get out of the way. When you first send her out look at her like you plan on murdering her and be quite aggressive.