
I would say that you can't do anything in 3 days, infact I would never try to work on a problem so close to a show.
You have a few alternatives
1 Go to the show and see what she does
2 Go to the show and only do jumping classes
3Don't go to the show
I would tend to go to the show and either do 2 above or speak to judge beforehand and explain problem. If he/she is agreeable if the dog hangs back from walk just ignore it and go on to next obstacle.
I wouldn't get too stressed my Beardie developed a fear of the seesaw but it passed. Have you asked your club trainer for advice, they will know your dog and will be the best person to ask for help.
Hope it works out
Anne