Shadow/Strange
My method isn't so much bringing her back from the dead. It's more reversing time, to before she passed away. I'm sure you can gather, there's quite a bit of fine print to a transformation like that. It's possible she'll lose all of her afterlife memories. I'm also not sure if the spell will last if she ever leaves the hotel grounds. Specifically, if she ever returns to her world, she might return to the state she was in before coming to the hotel.
Normally I'd also be worried about splintered timelines but us being here in the first place already poses that problem. But, she would be completely alive and the only memories she would be missing would be the ones after her death.