Well a few things
1) That's not the UK version of American Idol
2) A.I. I believe is limited in age, because they want "young" talent
3) As great as she was, doesn't A.I. make them sing all sorts of styles, she seems to have a good voice for that style of singing, their season 1 winner Paul Potts also had a great voice, however to have him sing R&B.. he probably would fail
4) Lets me be honest, if they saw her, they'd reject her immediately because of the way she looks, its our society, what the show "breeds".