Lots of Barrel and Trail saddles have short skirts. I just found a nice synthetic trail saddle with a 21″ skirt that comes in a few different sizes. Also, if you’re not totally attached to having a horse, look into Australian saddles or Endurance saddles. They will all have shorter skirts. The only other thing i can think of would be her shoulders. Make sure she hast unrestricted shoulder movement. If it becomes an issue with these short skirted saddles, look into saddles made for gaited horses. Hope this helps!