Being a herder, she could easily work several children at once, keeping everyone grouped. God forbid one of our kids' playmates broke into a run during a ball game (invariably, she’d be sent inside to observe from a window).
I once watched her block a much longer-legged, 120 pound Weimaraner from entering our yard. He finally gave up and sat down on the sidewalk until she said OK. (He used to sneak out of his yard and bark at our front door for her to come outside. They loved each other.)