Look, I understand her being jealous of someone who came out of nowhere and suddenly got the position she took 5 yrs to get (completely reasonable, I would genuinely tweak out too) but the way she's acting is so freaking immature it hurts
So... did she also make the hot dogs? Bc I imagine there would be some sort of sausage in the kitchens, but hot dogs (like these ones) are very different from the typical sausage. Making the bun wouldn't be much of an issue, so I'm not bothered by that. But I feel like there are other, easier things you could put ketchup on. I mean, it's a bit hard for me to imagine any well-trained prince eating an undignified and messy hot dog, even in a private snack setting. Tho I don't begrudge any princes who like a good hot dog from time to time.
Another reason why tomatoes were thought to be poisonous by aristocrats in Europe was because at the time plates had lead in them and tomatoes would absorb it, thus after eating them they'd get lead poisoning.