First, she can only keep on foot planted when she turns. One common mistake is to want your horse to step backward and turn. A pivot is all about forward motion. Walk her forward in a circle and bring the circle tighter and tighter untill the hind quarters are walking a smaller circle than the frontquarters. As the circle get smaller pretty soon the front end will be walking around the hindquarters and they won't be moving much at all. Two things are important to remember, you need your horse moving well off your leg and you need to keep your horse stepping forward. If you go to Larry Trocha's website he has videos and explains the mechanics of a turnaround very well. It's also important to be able to move the hind end really well off your leg.
There's nothing like the Rockies in the springtime... Nothing like the freedom in the air... And there ain't nothing better than draggin calves to the fire and there's nothing like the smell of burning hair. -Brenn Hill