Joshua Jones
When all is said and done, all's quiet and boring.
(Sorry that my responses are a bit broken up; my wife is working and I am chasing my own little Cinderellas...)Sorry to belabour the issue, but how exactly are you defining "auspicious"? The fact she has the perfect dress for the ball would be auspicious, because it would be a good omen for what is to come, but the ball itself can't be a good omen of anything, surely.
The horror of it isn't a problem, because the genre was open. But again, I can't see a twist here, unless you mean the twist is instead of going to the imaginary ball, she's going to suffer real privation, but I think that's far too remote.
Something like "Mommy and Daddy had used their sleepy-time magic 'jections again, but she'd never seen them lie so still. They were very cold. And she was very hungry. She couldn't reach the cupboard with the food. But she could go to the ball. She danced out of the room." That would take you over word count, so would need pruning, but I think gives the information and avoids any risk of her being seen as the killer.
I toyed around with something similar for the ending, but between the word count and the likelihood that she would be desensitized to their opioid abuse caused me to lean away from it. I think that is something I struggle overall to portray; people who are hardened to bad situations in a close 3rd or first person narrative.