V.B.
It may sound mean, but you are definitely doing the right thing. Just ignore her. Don't even look at her when she's doing it. Try to walk into another room (where you can still see her) if possible when she's doing this. She is looking for attention and if she gets it (positive or negative), she will continue the behavior. Make sure your babysitter knows how to handle it also. It may get a little worse before it gets better (she will dial it up to see how far she has to go to get your attention), but it will stop when she realizes that it isn't working. Be sure to praise her for getting your attention in more positive ways and try to figure out when this is happening (i.e. is it a specific time of day such as when you first get home and everyone is busy?). She may just need a little one on one time (say 15 or 30 minutes) so that she won't act out. Best of luck to you!