Awesome help everyone! We've started working on backwards heeling and perch work today, and things are going smoothly... mostly. She tried to take my finger off with the tug, but other than that, we're good, lol.
If anyone else has other pointers/videos/articles, that'd be great.
My rally class's advice was basically hit her butt with a stick until she stops turning out, which wasn't really what I was looking for.