AuraTwilight
The Sorcerer of Smiles
- Location
- The Silver City
In the manga it implies that both witches and magical girls go to some sort of afterlife after death, even before Madokami (Sayaka and Kyoko have a little reunion after Kyoko kills them both) but that is of questionable canonicity due to some contradictions between the manga and anime.
I headcanoned those as post-Madokami epilogues, myself.
Hypothetical:
The soul gem contains the soul of a meguca. We also presume that the grief seed does as well. In other words, the souls is inside two nested containers.
When we do magic, we generate grief. This is presumably a product of the contained grief seed, which implies that doing magic is actually a function of the contained grief seed. That means that the soul gem is just... 'filler', a buffer to prevent the grief seed from losing itself and turning into a witch — a magical girl insane with grief.
That means that, to rebuild the magical girl from the grief seed, we need to create a new outer buffer.
That outer buffer appears to be the quantity of 'hope' that the magical girl holds onto. They become a witch when they lose all hope. Is it possible to 'regrow' that hope?
Note that we remove grief to cleanse, we do not add hope/magic. That hope is thus presumed just sort of always be there; a fixed constant, and a representation of the girl's wish.
Is Hildegarde, with neither grief nor hope, stuck in an endless state of apathy?
How would one recreate that outer shell? Perhaps being brought back into proximity of their original wish? The thing that was their hope in the first place?
MADOKA WISH TO BE A HOPE-BENDER FUCK YEAHRG.
We only have Sayaka's ramblings to base that on, though, and she was pretty much tripping on despair at the time.
Uh, Kyubey ALSO said it. Like, he was even paraphrasing it when Madokami was happening. Hope is totally a thing. It's PROBABLY Magic imo, but it might not be.
It's also possible that 'Magic' is just the applications of Hope and Grief; the two energies are just the fuel and the 'Magic' is applied Work.