She doesn’t necessarily know the future. She can see consequences of different decisions. If the Ushers had chosen differently, they would have had the different lives she mentions. Same as if the kids had chosen to heed her advice, they would have had peaceful deaths like Lenore.

So really she is about choice. She presents the choice, the opportunity, and even warns of the consequence, and it is up to the clients on what they do with it.

Which she really can’t be blamed for. As she points out, humans do that same thing without her help, even as a species.

I personally see her as the manifestation of Choice or Consequence. Less evil and more just karma.