Like with my reply to your other thread, you need to step back. You're trying to go too fast. You stop heeling her BEFORE she "gets too wide." You reward for correct position and do not allow her to practice the wrong one. It sounds like you need more foundation work which was the gist of my other reply. There are tons of YouTube videos on teaching pivoting, you can lure, you can shape, etc. I use a rubber feeding bowl for livestock turned upside down that I got from tractor supply.