When she refuses to back she just stands there. I am leaning back and pulling constantly with my hands. After standing there forever I started kicking (asking with my legs wasn't doing anything), with that she started half rearing/spinning and trying to head back toward the barn.
She has had a TON of roundpen and groundwork using different natural horsemanship methods-her owner is really good at that. In the roundpen if you tun your back or step in front of her you get a nice stop...it just won't translate to under saddle.