I doubt you will get any help from them. Years ago I knew somebody who was all signed up for nationals then ended up having major surgery with a min of 6 weeks to heal. They wouldnt refund any of her money.
Youth entries have to be in by August 1st! So even if you do not have a horse qualified yet - but know you will by Nationals - you must have the entry in or you can't show. Knowing we had the show in Okeechobee to qualify.... entries were sent in!!