I do some K-testing on my own, and here are my calibrations:
psychic getting information from an astral entity: true
entity on the other side of this psychic: 140
psychic him/herself: 330
entity is not interested in the Highest Good of the clients: true
psychic knows about the intentions of this entity: false
psychic has good intentions in mind: true
lol, talk about spiritual naivete...
the client you know and her best friend should not follow the psychic's advice: true
As for how to approach your client with this news...I'm getting unclear answers. It seems like just telling her about it may not be enough to persuade her, she may not believe it. Might be something karmic.
Your intuition is right about Light spirits not meddling. They can only guide you, and they often tell you the reasons behind it. They never try to force you one way or another. Look at Erin's psychic readings, those are how they're supposed to be done.
Hope this information helps.