When you prod and find that she's the root of the problem, are you SURE she's the root and not just the root that the bus driver or teacher or whoever happened to see? Is there any possibility at all that this other girl is doing something that no one else is seeing, and therefore your daughter isn't lying? That's just something to consider. As for getting her to stop, one thing I would try here, instead of punishing her, is to see if you can separate her and the girl she is lying about. Can the bus driver put one at the front and one at the back, or at least different enough seats that they can't communicate? If you get her away from the person she is lying about, she may stop. I agree the lying is wrong, but in this instance, it might be best to just eliminate the reason for the lie and let it drop if she stops. If she continues, remind her that when she doesn't tell the truth, people won't believe her when she is honest.
at 3:37 PM on Oct. 16, 2009