Not the best premise, to be honest, simply due to the idea that some other-worldly force made the MC into an unkillable-zombie.
I can yammer on all day, but tldr: being made into a zombie ain't that interesting, now is it?
@Podi125
Sure, the old mantra "there are no bad tropes". It's more of how it was played out in context, which I didn't find particularly interesting. 'Like if the mystery was about her circumstances, then it quickly evaporated into: "she's just a walking corpse, that's all there is to it."