I suspect this may be an agency touting various girls. Profile and feedback is very similar to one I nearly saw in Bournemouth last year. Similar to you, they bid a much lower price on a RB.
I set up the booking and then got a call from a bloke saying he was "security" for the WG & would be accompanying her to my hotel and could I pay him before the booking, just so that there wouldn't be any problems!??! He assured me he would leave straight away and then we could "complete the booking"
I said you know what, I'll pass.
One thing that did warn me about them was that whenever I emailed her a query, I got an almost immediate response, which seemed odd and in retrospect should have pointed to an agency lurking behind the scenes.
Hope that helps - approach with care I would say...