I am in WI too, and my DD did 4-H and Open shows a few years ago. Unfortunately judges were still rewarding the peanut rollers, shuffling, lame-looking QH in the WP classes in our county and state fairs. Our last year in 4-H was 2008, don’t know if things changed dramatically since then, but the fact that your new boarder has a QH is already a plus. We showed our Arabian who could never place against the QH in WP, so DD focused on the English classes instead. She did very well in Western showmanship though, and to a lesser extend, Western Horsemanship.
I don’t mean to say you can’t do a good job with your new boarder, but our experience has been that kids who had a very experienced 4-H or Western trainer did a lot better than those who didn’t. We had an excellent, experienced 4-H trainer for both Western and English disciplines, and her students were/are in the top placings at state level. DD had this trainer, a dressage and a jumping trainers, and she learned all the important stuff from each discipline from the different trainers, and did well in each discipline (except for WP, but it was breed biased, nothing to do with the trainer). What each instructor taught clearly didn’t translate across the disciplines.
Maybe you can convince her to do dressage instead, I know my DD fell in love with dressage once she found a good instructor.