Uh, the thing about being bite by a vampire is usually the body doesn't age or rot and becomes more resilient/powerful.
I mean the other things are "dying in light, aversion to garlic/holy symbols and needing permission to enter places" but those dont seem to be working here.
Guess the bite killed Lavie's soul but kept the body intact. Susie's soul took over the body but the vampire aspect didnt work since its not the same soul or something.
They need to look real close at Susie's neck. >.>
But that would still be heartbreaking if they found out their adopted daughter is puppetering their biological daughter's corpse. ._.
So lavie is really dead, now people can't say that mc is using lavie body
Or she is and this proves it more.
Lavie's body was buried and probably wouldn't decay because of the vampire bite.
The body Susie is in had to come from somewhere, the fact it looks EXACTLY(not close to, not sorta like, but exactly) like the dead girl to where literally everyone who knew Lavie is shocked on meeting Susie can't be a coincidence.
The fact it was a vampire bite of all things, when anything else would probably discredit the theory, almost makes this confirmed honestly.