Darkhilt wrote...
Oh and for your questions, yes telepathy is very real, not exactly in the way you would perceive it but simple sensory details that are encoded in such a way in the environment or through the motions of others that causes your brain to react thus allowing for telepathy to take place but as it requires stimulus within perceptionary range,thousands of miles without prior training and heritage seems lunatic at most.
What you seem to be implying, in a vague way, is that 'telepathy' is a preternatural aptitude for picking up things such as body language and microexpressions. Although your mention of it being possible at great distance at all makes me think you also think there is something supernatural about it.
I would say that some people have a better natural ability than most to read people's emotions, and that this might happen subconsciously, so that the actual result is that person typically having a good idea of how people are feeling, even when those people aren't actively expressing their emotions, without knowing exactly how or why.
I wouldn't call it telepathy, I would call it having a certain perceptiveness.
I don't believe that anyone is actually capable of real telepathy; as Takerial mentioned, no one has ever been able to prove that such powers exist. In the great many experiments conducted on the subject, no one has ever done better than chance would suggest they would do by guessing, and in most cases, they actually preform worse than chance.
I am not a psychological professional, but as someone who has been a patient, and who experiences auditory hallucinations, I would say that it sounds like your sister is hallucinating, and is probably also suffering delusions.
If you want to know for sure, get her to a professional. Failing that, maybe a priest or something, I don't know.