She refrains from eating sweets when she feels she's disappointed her Mother, so that's not much of a surprise. You should have tucked a few into her pockets anyway. That's what I always do.

Of course Bella was behind all that. Not that she's admitted to it (though it's been fun trying to trick her into doing just that). Narcissa was proper mortified, as you know. Can't say I was too surprised, myself.