I don't see that I have to. Anecdotal evidence is worth looking into but by itself is not strong evidence at all. How many other people did she bump into and say that, or something similar, to that day and through her life? Why do some people apparently manifest this ability and others do not? Why, once someone decides to make money out of said abilities, does everyone here universally condemn them? If you were psychic and knew it wouldn't you want to make a living out of it? And yet apparently all such people are "just frauds", but the man in the street isn't.
I am sure there are many such anecdotes but on closer inspection a lot disappear. Up until a couple of days ago I thought that animals can predict earthquakes. Unfortunately, this appears not to be the case -- certainly not any more accurately than we can ourselves -- which naturally disappointed earthquake scientists because it would be nice to have more warning of these destructive events.
If I make up any old story and added "explain that" at the end of it, would you trust me and change your views on whatever I was talking about? "I was walking down the street the other day and could swear I saw someone in a red coat on the other side. He fiddled with his zip for a while but then he just seemed to vanish slowly into thin air..."
I'm not calling you a liar Mrs_O by the way, but I hope you can understand my point. When scientists perform an experiment they observe carefully over a long time and under controlled conditions looking for a specific effect. If they find it they note that, if they do not then (hopefully) they say so too. This method of investigating the World yields real, demonstrably correct results. We are, after all, using computers to talk and not psychic communication.
Is it not rational to assume that (a) psychic abilities ought to be experimentally verifiable -- everything else so far has been -- and so (b) note that they have not been despite many attempts to try? The burden is, as far as I am concerned, now on those who would believe in such abilities to provide more convincing and concrete evidence for them.