
Seriously? That would stop RIGHT NOW. I would have to either be REALLY rude, or possibly threaten her well being. I'm not a big fan of having my personal space invaded (can you tell?

) and I would have to make sure that came to a screeching halt.
Besides that though, I think the fact that she is getting reactions is keeping her going. I have been known to shush coworkers.

Maybe if you tell the bosses that your productivity is being affected, and have a solid suggestion ( like, moving to an office, or a cube as far away as possible) you can get some resolution. Good luck, she sounds like a treat!