Kimmy,
Like many of the others, I would call the restaurant. A $10 tip for a $29.00 bill is a darn nice tip. As many others have pointed out, not everyone is honest and your waitress may be doing this on a regular basis - not all people check to make sure their charges match their statements. I think that might especially be true of restaurant bills where you may not recall the exact amount the same way you would the purchase of items from a store. This waitress could have a pretty good thing going for herself.