I use to bring a book, my head would get to worrying about it too much (was she there, was it the right day, what if it's not or she forgot). Fortunately, at the end my T and I were the "only" ones in the afternoon (no client before or after me) so I could get there early and wait in my car in an obscure part of the parking lot where I could still see when she came and then I'd "follow" her in after a minute or two, LOL