She's gonna have to put in a lot of work to make up for this. But I don't know, she looks kinda good with antlers.
As far as I'm aware, there is no tradition where eating Santa's cookies comes with an ironic punishment, so this is probably some sort of bwomp-related retcon that Bloom unknowingly manifested through her powers.
Come to think of it, I didn't even know that Santa existed in the same universe as Bloom. None of this makes any sense.