The trick to widespread spells was always power. Things like that needed the coven, and the coven would only interfere if it threatened the town. Sure, Addison would possibly lessen effects if she could, especially if something was going to negatively affect someone she cared very much for. But witchcraft for the sake of it was against the teachings of the Guiding Hand, and Addison wouldn't ask that of her sisters and brothers.
"Oh, I'm sure they can make it through one lunch period without utter chaos breaking out. People have food, they're tired and recharging. It'll be fine, stop worrying." She might even be more prone to sending out some calming charms for Calliope to just hand to people that looked fed up.
"Deputize me and the power might go to my head. Before you know it I'm running against you, taking over the town, outlawing hats." Not that she would, but it was funny to consider. She'd be a terrible Sheriff. "But," and she turned a little serious, "I could always keep an eye on things, while you took Ranger home, if it made you feel better?"