Nice theory, and good question.
But i agree with some of the first posts, i think she's not dead, but she's just angry towards richtofen, who is evil himself. She was transported to her room, but i think that it wasn't because a teleportation device was there, but instead, it randomly sent her to a different time, place, or even dimension, but she just happened to end up in her room. I do agree with the thought of her creating a game, where she could play with the four heroes, but what about richtofen? i thought she hated him, so why would he be one of the heroes? I don't think that she could control the zombies, they were already there, so she probably just plays with them by letting the heroes kill them?
that's my theory.
I agree with all of that except I think that Richtofen is insane and not evil if you listen to his lines he randomly changes from normal voice to crazy Nazi voice.