What Went Wrong? Damiete Charles Granville representing Nigeria at the Miss World Contest?

Faces of 2012 Miss World Contestants

In the just concluded MBGN 2012, Miss Isabella Ayuk was crowned the Most Beautiful Girl In Nigeria  which also qualifies her to represent Nigeria in the Miss World contest. But this seems not to be so as her face is no where to be found on the Miss World 2012 website, instead what we see is that of Damiete Charles-Granville who was the first runner up to Miss Ayuk and should have been representing Nigeria in the Miss Universe contest. What went wrong? is Isabella giving up her crown?