Dizzy can be almost as much of a lovable goof as Cloudkicker; we don't get enough of her. Then again, I wouldn't want it to eat into Moondancer's best pony screentime.
Do it! Seize the cake while everypony's still confused! This might be your last chance before order is restored and the wedding ends!
You can't miss your chance!
I think she's more like "seriously?" than torn. Though now that the idea is in her head maybe she'll try to steal the cake to sell later.
Though the fact seemed even little concerned for Dizzy's safety is surprising. Usually Cherry's flagrant contempt for everypony rivals Sparkler's.