[It's a strange tale, Ivar knows, and even he never got all of the details. But he's got enough of the story to tell the doctor what he needs to know to possibly help .]

She died in her own world, but since she was a necromancer and her spirit was outside of her body at the time, she couldn't properly move on to the afterlife. Her spirit and that of her daughter's was trapped in between and begun to rot. Don't ask me how that works. When she was pulled here, she was brought back to life.