I think MF means that not all of her Enjoys are included in her rate, and this isn't specified on her profile.So you could potentially turn up for a booking with her and find all sorts of stuff is extra (OWO, CIM, kissing, etc, etc).
Good girl, maybe she has got a business head on her shoulders ?
I dunno, her 2 hour rate is 3 times her hour rate. Let's see how quick it changes!