She's a graduate of the Ican'tbelieveitsnotmoreexpensive verbal training at the QVC School of Presentation. Previous graduates include virtually everyone we see on screen.
The advanced diploma involves studying for the open mouthed eye-rolling expression when looking at the monitor and back to the camera, in mock horror.
There's a transatlantic PhD in it, presumably from Harvard Business School, employed by the American guests, such as Tova and Basso. This consists of a rigmarole which starts with them guesstimating what the price would be when they were in the USA, and then, voice rises in pitch, they got here and were told the price this morning in UK for the TSV and they are shocked.
Slightly off topic of Marv's presentation, did you notice the Ican'tbelieveitssuchgoodvalue pitch this morning for the collagen gloop (can't work, Google any scientific reviews on collagen and skin). The pretend value of the 5 products bought separately (why would you?) was £107... but that included 5 x p&p, so a good bit of the extortionate price is not even for the collagen gel, but their postage charges!