This is going back a good 20 years to when she was chosen to present CBBC on BBC1. I seem to remember that they had a line-up of wannabe presenters, who did a spiel each and then the viewers at home had to tap their TV screen. The taps equalled votes, which showed on a live bar graph. The one with the most votes got to be the presenter.
There's no way that this could have worked, is there? It's a very vivid memory though!