Or try this....never fails! Have your shoes on and purse in hand. Answer the door with the kid at the door and if you are on your way out, then there is no reason to enter. Lock the door behind you as you explain you are on yor way out, get in your car and drive away. Or...don't be so passive and nice about it. Some people just won't ever get it and need to be told. Let her know you have stuff to do so you can't chat at the door. Open the door and say good bye. If this isn't working it's because you aren't executing it properly. If they keep chatting and stay, it's because you are letting them. Dominate the situation and be done with this.