Interesting take, but in fact there wasn't to be a soul migration and the daughter was killed when still a baby so memory recall wasn't necessary. The mother's latter experiments (after many years spent on the usual galvanic processes) had been concerned with the Life Essence, and she'd discovered a way of transferring LE from a living body into a dead one to reanimate the latter (but only where there is a sufficient level of LE compatibility such as is found between close kin) but the LE transfusion necessarily kills the donor. Her former husband and several of the legislators and their families had been among those who *ahem* helped on a non-voluntary basis in her research, so there was no question of revenge here. Only, as has been said, obsession, sadly. Unfortunately, I found it a bit difficult to get all of that and the story into 75 words.