What she did will most often scare a mountain lion away. Usually, they’ll run from a person facing them and acting aggressively. They’re not like bears.
If you’re in the mountain lion country and have dogs, know that they’ll eat dog food, too, at least in the winter. I caught two of them eating my dog’s food, while my dog was indoors one night. The moon was bright. It was too cold even for my dog in his doghouse (minus-30s).
When I saw them, they bounded over the six-foot fence around the dog’s pen and bounded up the hill through the ice, splitting about 70 yards apart from each other while running. They “bounded” to keep from getting slowed down by the large, grainy patches of ice on the ground (consistency of sand, really, up to a foot deep in places). They stood up there about 200 yards away and watched me.
Usually. I know a guy that had a cat drop into a crouch and come at him. He dropped to a knee and blew it away. Fish and Wildlife said it was old and very hungry.. The shooter had seen it miss a chance at a dos he was watching, earlier.