Years ago a recently acquired mare was handy with her back feet which also happened to be in dire need of a trim. I'd worked with her almost daily for several weeks but as soon as I touched her hock she'd let fly. I tied a thick rope around her neck the put a rope around her ankle and ran it through the neck rope and brought the hoof forward. She had no choice but to stand still. This allowed me to pick out her hoof and break off some sharp pieces. Funny thing, I never had to tie her foot up again and she was good with the farrier.
Called a scotch hobble. I use them to teach a horse how to have back feet handled also if they want to kick your lights out. This is a great video. I will hold till the horse stop struggling and relaxes and then release rinse and repeat and mix with basic handling and desensitizing lessons till you can safely handle the foot. It doesnt take long if you do it correctly.
There's a lot you can be doing before you go to the farrier and lots of good advice already
Since she's the way she is because of too much rough handling a low dose of ACE when she gets there would be better than another battle that she'll just keep on associating with having her feet done - if you haven't sorted out her problems in time. Talk to your vet about dosage but don't travel her sedated as it might affect her ability to balance properly in the trailer
My scotch hobble wasn't quite that fancy but it worked the same. As I mentioned that after this once she stood great for having her feet picked up and she even developed the good graces to lift her leg as a warning and set it down. If you kept doing what you were she'd kick. Usually it was someone too rough around the hocks with a stiff brush or curry. My good Alberta farrier had a few horses he had to lay down and tie up their legs in order to trim them. Once down the horse relaxes and accepts it's fate. A farrier can't afford to get beat up by a spoiled horse.