Makings here of a MNet-generated modern Hans Christian Anderson tale (he knew a thing or two about child abuse and torture, ever read the unabridged stories?)
So here we've got white-haired universal granny baking little cakes with just a hint, a suspicion, a pinch(geddit?) even of some illegal powder in the cakes and frosting, which she tricks the YI into baking with her and then eating.
The cakes are baked in the range oven of an open wood fire, constantly being poked into hotter and hotter flames with an iron poker(oh yea! Really getting into this now..)
She, of course, has a black cat with strange, unblinking, mesmeric yellow eyes, ready to lull poor little flaxon-haired Young Innocent into a trance until the Suspicious White Powder does its stuff.
Her husband, partner in crime and sometime wood chopper,, while posing as the Gallant Rescuer of the young mother and her poorly son, whisks her away to a busy A&E which, with the current NHS cutbacks to general practices, is guaranteed to be full and ensure many hours away, while they have their Wikkid Way with the poor, flaxon-haired and by now drugged YI.
While they have their Wikkid Ways with Poor Innocent, they assuage the anxieties of the young mother with frequent phone calls to make sure she's still there, cunningly masking this true reason with many expressed concerns and reassurances.
I'm thinking that the red hot poker comes into play at some stage, but it's sooty blackness is eventually washed off the body of the YI in a bath. With bubbles?
Thank the Good Lord that the sound of her mother's dear voice awakes YI from her stupor. Her mother, despite protestations of the Wikkid Twosome that YI can be safely left there in the charge of the Mesmeric Cat overnight, picks up her little girl and takes her safely home...
Something like that?