Good deal, then you are doing everything right! If they are running a separate junior show, not showmanship, the birds will be ranked with all other junior birds, just like the open show. If they are also in the open show, like a dual entry (we do that here for the club I am show secretary for) and they will be judged both against just the juniors, and then again by a different judge against the open class exhibitors as well. If it is showmanship, its more focused on the merits of the exhibitor, knowing their stock, the care, history, etc over the quality of the bird for that kind of judging. So, I think you are ready to go. I think the key to remember for the first time, is to do what you can, and I think you have with the prep and coming here to ask questions and just have fun at the show! If there are no visible faults like sprigs and etc, then it will just depend on what other birds she ends up with in the class for competition. I hope she does well and please let us know how it goes!