Don't blame yourself if it wasn't up to scratch first of all. She's expensive, so it needs to be damn good at that sort of money.
I saw her getting on for two years ago and had a great time, although I was new to punting at the time, so they were all exciting back then. I remember the meet well and would still give it a positive as it all flowed and I found her chatty and friendly, but it is a pretty vanilla GFE, judging by my recent standards. She did actually get me to pop twice in 20 mins from penetrative sex which is quite an achievement. Sounds like things may have slipped recently. I'd also say her 50th birthday passed some time ago.
Now, I wouldn't return on the grounds she's far too vanilla for me, and certainly not at that price. She ain't as posh as she makes out on her website either. You can get much the same thing elsewhere for a lot less cash, for sure.
tcm