She is genuine and has been around for a while now. I recall exchanging emails with punter in 2008 and he was disappointed with her, more so because of of her age (was a lot older) and her size (was a good few sizes bigger). He retired a few years ago, but some of his FRs PNet are still there, although I could not find the one for Samantha.
When you visit her website, there's not a single photo of her in the full, so that you can gauge her body size, ar look at her properly.
If she still operates out of motorway sevice station hotels, then it more than likely, it is the same one. This is what he said:
"Thought I would let you know that I have been to see Samantha who operates out of the hotels on the services of the M1. She says she is a size 14 .... not a chance, I guess more of a 20".