Until your next show just keep working. Back in the days when I showed (and coming soon again), I dealt with a few steers that had major attitude issues. After I'd catch them in the morning, I would pull their heads high. Now when I say high, it was a get them as high and tight as I could. That was one of the best assets to knock the attitude right out of them. While they were tied Id work with them of course, and do extra stuff in the barn so I could keep an eye on them. While they are tied make noise in the barn, crank the radio, have new people come over. Whatever new things you can introduce her to will help get her ready for the show. After about an hour or 2 Ill bring their head down to the level. Follow the tying by a walk. Always, always keep a show stick or cane with you until she is broke. the moment she goes to put her head down or start high stepping to take off hit her in the nose. The one steer I had went to drop his head and take off at Badger Kick off and he ended up with a show stick bent across his nose. With that being said, I always, always tried to break them quietly. But there are times when you need to show the animal that you can over power them, for your safety and others. If yo have the opportunity to load her up on occasion and take to to a new place like a neighbor or friends farm try that. expose her to new things until she literally becomes bomb proof. The last thing was cattle calm (pellets or paste.) Most of the shows around here allowed them as long as they were herbal (which I believe Sullivans are.) We would dose them an hour before they would get out of the trailer if they were a problem child. If we happened to have one that had real anxiety issues we would keep them on a lowered dose of the pellets during the time we were away to take the edge of them.
Hope this helps ;D