Believe it or not, Aussie are also considered loose eyed, upright herders. I would really work with the person who I felt most comfortable with and who was best able to work with my dog.
You might want to check out the other folks in your area and just see how they work with your dog, or dogs like yours. You never know, you might decide that this woman is the best fit, or you might find someone more familiar with GSDs herding.
Check out the AHBA site. It has a lot of good information in general. The were a lot more accessible than AKC herding, but that might be due to my location. Idaho isn't a hot bed of activity in much of anything.
I hope you continue to have fun with it. Just wait until you get knocked over the first time! Those sheep seem to know just where to hit you!