As lankeela says, perhaps she had no choice in the matter, oh god, memories of something spooking the horse and that awful feeling when you just know you're about to enter the land speed record. I still remember being so proud once when i managed to stay on and after we stopped, I jumped off to sit casually on a fence holding reins of the by now "who me, I wasn't spooked" horse., to wait for my companions. I fell off the fence onto the concrete and cracked 2 ribs.