In fact, this is a variation, Sage is not part of the original recipe, but it is used in some commercial mixes, like the ones that you can find in North America, which also add Lavender of all herbs sometimes, of a common mix called erbe provenzali in Italian, and invented in France (èrbas de Provença) and used extensively in Mediterranean cuisine. Not that she knows any of this, she just bought a bottle at the closest supermarket. But if you ever travel to Southern Europe, you will find a lot of dishes with that mix of herbs plus garlic. So, in fact, it is indeed an Italian/French/Spanish thing.