She’s looking at you. Not at the floor.
Ask any owner where it happens and you’ll get the same three answers. The rush to the door when she hears you. The corner into the hallway. The turn at the bottom of the stairs. She’s looking at you, not at the floor — and on smooth boards, her back legs are doing something her front legs don’t know about.
You would never take that corner the way she does. You don’t have to — you know what a fall costs. She doesn’t, and she never will. That’s not a training problem. It’s a floor problem, and floor problems are the kind you can fix.