if this person eats meat at all then remind her that meat doesn't really come from a grocery store. If she doesn't eat meat, I would just talk more about it. I like to put pics of some great cathes on my work lap top. Other than that I agree not to argue, you're not going to convince her so why waste the energy. I might be kind of funny to wear in one of those P3TA t-shirts (People Eating Tasty Animals)