Not to be too crude about this, but quit handling her like a horse. It has been said the only object here is to get her hauled, not trained. 1 or 2 CCs of Ace won't do anything on a full grown horse. Load her up with at least 6 CCs given orally while the horse is calm, walk away and wait 45 minutes for it to take effect. If you excite the horse prior to that she will blow right through it. If you use anything stronger, after the horse is in the trailer, wait till it wears off some or the horse has a good chance of falling down while on the road. Get her drugged, have a chute made to the back of the trailer, find some cattle folks to help and treat her like a bull. Drive her from behind (buggy whips, using the handle end or a stock sorting stick) and let her know in no uncertain terms the only place for relief is in the trailer. Turn the lights on in the trailer so its not a dark hole. Make sure your chute is set up so you can get the door shut as soon as she is in. Get her moving towards the trailer as fast as you can so she goes clear in when she goes. Less apt to rear at the door this way. It ain't pretty and who ever has to train her later to trailer load will have their work cut out for them, but this works. Have loaded multiple stray feral horses and unbroke race horses amped up on 20 lbs a day Omalene 300 this way. The worst part is you have already trained the horse to defeat you at loading, so completely change your approach. Once you get her in the trailer, get moving as soon as you can. Most all horses will settle down once they are moving. Don't go in the trailer and try and tie her, just leave her loose and go. At the destination, back up to a pen, open the door and get out of the way! She may rush out, she may just stand there. Either way, you don't want to get in her way. Good luck to you!
I would love to try Allot of many suggestions and If I had the means and materials I would.. I do appreciate all suggestions and Have Used some of this to learn and help.