It makes sense that Karen would end up in an institution after what happened. But she runs into people who won't help her, her sister believes it's all in her head and she runs into the roof where she's pulled to her death.

Besides that, it seems that it could've been what resurrection lacked. We got to see her sister uncover her death and try to stop the ghost with her boyfriend. Just replace the killer with Michael and the leads with John Tate & Molly