I don't understand animosity towards the person. Real threat or not, it isn't like she told people NOT to consume the products, that she be warned so she can be away from the product.
I think it would be considered a common courtesy to do so since it isn't TOO much of trouble to let her know that you want to have the food 5-10 minutes prior so that she can use the lavatory or something like that.
No? Am I in minority for thinking this way?