Amethyst is mainly here to try to do whatever she can to make sure Steven doesn't run afoul of the Rose Queen, but the possibility she might show up (or, worse, Nightshade -- which she knows is dumb, to think Nightshade is worse, but, well...) is putting her on edge. Fortunately, lavish food is an adequate distraction; she's kind of anticipating some of it will do stuff, but Elysium means it's fine. Sure, some of it might end up having non-harmful side-effects, but when has Amethyst ever let the possibility of some wacky nonsense happening to her stop her from pouring hors-d'oeuvres directly into her mouth?

Literally never, is when.

The disgusted glances from the members of the Summer Court aren't discouraging her either. She's keeping an eye on proceedings, but currently she's propped up on her tail where the food is at, trying to fit as many of some kind of small fancy pastry into her stomach mouth at the same time as she can. If the Court Fae are going to look at her like she's gross, then she's going to act gross.