This just occurred to me. There has
to be salt in there, one would think. I'd be pretty surprised if there isn't any.
You could suggest to the chef that she enters values on "the website with the free recipe calculator" (wink wink) and then print out the Nutrition Facts and post it for customers. As an incentive, tell her more people would be prone to buy something when they could look and make sure that they're allowed to eat it or not. But my guess is that she'll like the idea of using that recipe calculator, especially since it's so easy to use.
This would of course help you to know the Nutrition Facts as well.
It might even encourage her to switch to olive oil when she learns that it would be healthier. Although, it is more expensive.