I think I choke chain with a small hand leash on it that you can grab each time she jumps and jerk down... (i know, sounds harsh) or, really give her the knee HARD. (again, harsh). However, whatever the action is, it has to be very uncomfortable and unpleasant, or else she will think you are playing. Maybe even someone holding her with the hand leash when people arrive? Making her sit all the while the people are coming in? And lots of praise when she is successful...
And, the short hand leash is something you could leave on her when she is around you and safe from not choking herself. That way you have quick access to give her that reminder jerk downwards.