I need help deciding on a punishment for lying. Here's the situation:

I told her two days ago that she was to shave her pussy everyday. This morning while walking around campus with her, I happened to think about this and so I asked if she had shaved. She replied that she had, but her eyes veered off to the left and not to the right, meaning that she was creating a statement instead of searching for the correct one.

Anyways, since I knew she was lying I pressed her a bit and found that she was (of course) lying to me using the excuse that, "She didn't have time." So, I told her that I was going to consider a punishment for her and get back to her on it.

Here's my thought on it. Since a lie is spoken, I figure that spending sometime in solitude with a gag in her mouth and kneeling in a corner would be perfect. However, having spent numerous hours in the corner as a child, I know that doesn't really deter the behavior (never did for me, anyways). So, with this in mind, what might you all suggest for her?

Use your imagination ;~P

~Primus