How often are you taking her off the property when not hunting? I had some issues too in the early part of the season, when we werent getting out frequently, and when she was, it was a MAJOR outing the day of hunting. Little side trips to a local park with a friend, or trailer to another barn will help get her into a routine of being expected to load, stand, work, load back up–rinse and repeat. I realized that it was a little unfair of me to expect my horse to be perfectly behaved when her only socialization came every other week at the hunt. I started trail riding on the off weekend day, and taking “sick” days mid week to hunt more often, and it has gradually come together.
As for the ground manners, I recommend the rope style halters with the knots. There are a few great YouTube videos that can teach you some ground exercises to “switch her brain” on to you, and away from whatever is distracting to her. I’ve pulled out my rope halter more than once when my horse was acting silly and did my exercises. Sometimes I get looks, but it works, and I have no shame in doing anything that works! The worst part is that it takes me a bit longer to load my horse, so I usually miss out on the first pick of libations in the club house.