She did die recently. Her students continue to teach her methods.
When I was first learning to ride, a lot of her ideas helped me . A lot, too many to recall all of them.
I liked the idea of riding as if you had no lower leg (an amputee).
Grow up and down, like the tree.
Think of the horse coming up and under you in the halt, so you creat a place for him to come up into.
The eye in the middle of your chest, let it lead you.
All these things come back to me over and over again. It is a great book to start out with. You can add more later.
Without a horse, well, you can practice walking upright, growing up/down with your spine and feet, leading with the eye in your chest, and keep soft eyes.
All can be done while just plain walking around in everyday life.