Sounds interesting. I've never met her so can't comment on that, but yes the only thing the Ayrton post really does is support the OP. I get that somebody who might do a punt at £2k+ probably won't really be using this forum much but it's odd they would have signed up around the time of this review, not 6 months or 3 years before.
One thing I have learned in life is never to judge what a lot of money is. I'm sure dropping £5k on a punt is more casual for some people than £50 for many others. The bit that is most concerning if this is true is did she really threaten to out a punter to his wife?